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<title>VipsImage: VIPS Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
<a href="#libvips-VipsImage.description" class="shortcut">Description</a></span>
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<h2><span class="refentrytitle"><a name="libvips-VipsImage.top_of_page"></a>VipsImage</span></h2>
<p>VipsImage — the VIPS image class</p>
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<div class="refsect1">
<a name="libvips-VipsImage.stability-level"></a><h2>Stability Level</h2>
<acronym title="The intention of a Stable interface is to enable arbitrary third parties to
develop applications to these interfaces, release them, and have confidence that
they will run on all minor releases of the product (after the one in which the
interface was introduced, and within the same major release). Even at a major
release, incompatible changes are expected to be rare, and to have strong
justifications.
"><span class="acronym">Stable</span></acronym>, unless otherwise indicated
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<div class="refsect1">
<a name="libvips-VipsImage.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<col width="150px" class="functions_return">
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<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VIPS-MAGIC-INTEL:CAPS" title="VIPS_MAGIC_INTEL">VIPS_MAGIC_INTEL</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VIPS-MAGIC-SPARC:CAPS" title="VIPS_MAGIC_SPARC">VIPS_MAGIC_SPARC</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VIPS-MAX-COORD:CAPS" title="VIPS_MAX_COORD">VIPS_MAX_COORD</a></td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsImage.html#VipsStartFn" title="VipsStartFn ()">*VipsStartFn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
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<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsImage.html#VipsGenerateFn" title="VipsGenerateFn ()">*VipsGenerateFn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libvips-VipsImage.html#VipsStopFn" title="VipsStopFn ()">*VipsStopFn</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-SIZEOF-ELEMENT:CAPS" title="VIPS_IMAGE_SIZEOF_ELEMENT()">VIPS_IMAGE_SIZEOF_ELEMENT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-SIZEOF-PEL:CAPS" title="VIPS_IMAGE_SIZEOF_PEL()">VIPS_IMAGE_SIZEOF_PEL</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-SIZEOF-LINE:CAPS" title="VIPS_IMAGE_SIZEOF_LINE()">VIPS_IMAGE_SIZEOF_LINE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-N-ELEMENTS:CAPS" title="VIPS_IMAGE_N_ELEMENTS()">VIPS_IMAGE_N_ELEMENTS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-N-PELS:CAPS" title="VIPS_IMAGE_N_PELS()">VIPS_IMAGE_N_PELS</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()">VIPS_IMAGE_ADDR</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#VIPS-MATRIX:CAPS" title="VIPS_MATRIX()">VIPS_MATRIX</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-progress-set" title="vips_progress_set ()">vips_progress_set</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-invalidate-all" title="vips_image_invalidate_all ()">vips_image_invalidate_all</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-minimise-all" title="vips_image_minimise_all ()">vips_image_minimise_all</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-set-progress" title="vips_image_set_progress ()">vips_image_set_progress</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-filename-get-filename" title="vips_filename_get_filename ()">vips_filename_get_filename</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-filename-get-options" title="vips_filename_get_options ()">vips_filename_get_options</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()">vips_image_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()">vips_image_new_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-memory" title="vips_image_memory ()">vips_image_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()">vips_image_new_from_file</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-file-RW" title="vips_image_new_from_file_RW ()">vips_image_new_from_file_RW</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-file-raw" title="vips_image_new_from_file_raw ()">vips_image_new_from_file_raw</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory" title="vips_image_new_from_memory ()">vips_image_new_from_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory-copy" title="vips_image_new_from_memory_copy ()">vips_image_new_from_memory_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-buffer" title="vips_image_new_from_buffer ()">vips_image_new_from_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()">vips_image_new_matrix</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-matrixv" title="vips_image_new_matrixv ()">vips_image_new_matrixv</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-matrix-from-array" title="vips_image_new_matrix_from_array ()">vips_image_new_matrix_from_array</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-matrix-from-array" title="vips_image_matrix_from_array ()">vips_image_matrix_from_array</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-set-delete-on-close" title="vips_image_set_delete_on_close ()">vips_image_set_delete_on_close</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">guint64</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-get-disc-threshold" title="vips_get_disc_threshold ()">vips_get_disc_threshold</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()">vips_image_new_temp_file</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write" title="vips_image_write ()">vips_image_write</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()">vips_image_write_to_file</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write-to-buffer" title="vips_image_write_to_buffer ()">vips_image_write_to_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write-to-memory" title="vips_image_write_to_memory ()">vips_image_write_to_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-decode-predict" title="vips_image_decode_predict ()">vips_image_decode_predict</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-decode" title="vips_image_decode ()">vips_image_decode</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-encode" title="vips_image_encode ()">vips_image_encode</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-isMSBfirst" title="vips_image_isMSBfirst ()">vips_image_isMSBfirst</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-isfile" title="vips_image_isfile ()">vips_image_isfile</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-ispartial" title="vips_image_ispartial ()">vips_image_ispartial</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-copy-memory" title="vips_image_copy_memory ()">vips_image_copy_memory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()">vips_image_wio_input</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-pio-input" title="vips_image_pio_input ()">vips_image_pio_input</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-pio-output" title="vips_image_pio_output ()">vips_image_pio_output</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-inplace" title="vips_image_inplace ()">vips_image_inplace</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write-prepare" title="vips_image_write_prepare ()">vips_image_write_prepare</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-image-write-line" title="vips_image_write_line ()">vips_image_write_line</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-band-format-isint" title="vips_band_format_isint ()">vips_band_format_isint</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-band-format-isuint" title="vips_band_format_isuint ()">vips_band_format_isuint</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-band-format-is8bit" title="vips_band_format_is8bit ()">vips_band_format_is8bit</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-band-format-isfloat" title="vips_band_format_isfloat ()">vips_band_format_isfloat</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-band-format-iscomplex" title="vips_band_format_iscomplex ()">vips_band_format_iscomplex</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">int</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-system" title="vips_system ()">vips_system</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsArrayImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-array-image-new" title="vips_array_image_new ()">vips_array_image_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsArrayImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-array-image-newv" title="vips_array_image_newv ()">vips_array_image_newv</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsArrayImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-array-image-empty" title="vips_array_image_empty ()">vips_array_image_empty</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsArrayImage</span> *
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-array-image-append" title="vips_array_image_append ()">vips_array_image_append</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> **
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-array-image-get" title="vips_array_image_get ()">vips_array_image_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">VipsImage</span> **
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-value-get-array-image" title="vips_value_get_array_image ()">vips_value_get_array_image</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libvips-VipsImage.html#vips-value-set-array-image" title="vips_value_set_array_image ()">vips_value_set_array_image</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsDemandStyle" title="enum VipsDemandStyle">VipsDemandStyle</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsImageType" title="enum VipsImageType">VipsImageType</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsInterpretation" title="enum VipsInterpretation">VipsInterpretation</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat">VipsBandFormat</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsCoding" title="enum VipsCoding">VipsCoding</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsAccess" title="enum VipsAccess">VipsAccess</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libvips-VipsImage.html#VipsProgress" title="VipsProgress">VipsProgress</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <vips/vips.h>
</pre>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.description"></a><h2>Description</h2>
<p>The image class and associated types and macros.</p>
<p>Images can be created from formatted files on disc, from C-style arrays on
disc, from formatted areas of memory, or from C-style arrays in memory. See
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</code></a> and friends.
Creating an image is fast. VIPS reads just enough of
the image to be able to get the various properties, such as width in
pixels. It delays reading any pixels until they are really needed.</p>
<p>Once you have an image, you can get properties from it in the usual way.
You can use projection functions, like <a class="link" href="libvips-header.html#vips-image-get-width" title="vips_image_get_width ()"><code class="function">vips_image_get_width()</code></a> or
<code class="function">g_object_get()</code>, to get <code class="literal">GObject</code> properties. </p>
<p>VIPS images are three-dimensional arrays, the dimensions being width,
height and bands. Each dimension can be up to 2 ** 31 pixels (or band
elements). An image has a format, meaning the machine number type used
to represent each value. VIPS supports 10 formats, from 8-bit unsigned
integer up to 128-bit double complex, see <a class="link" href="libvips-header.html#vips-image-get-format" title="vips_image_get_format ()"><code class="function">vips_image_get_format()</code></a>. </p>
<p>In VIPS, images are uninterpreted arrays, meaning that from the point of
view of most operations, they are just large collections of numbers.
There's no difference between an RGBA (RGB with alpha) image and a CMYK
image, for example, they are both just four-band images. It's up to the
user of the library to pass the right sort of image to each operation. </p>
<p>To take an example, VIPS has <a class="link" href="libvips-colour.html#vips-Lab2XYZ" title="vips_Lab2XYZ ()"><code class="function">vips_Lab2XYZ()</code></a>, an operation to transform
an image from CIE LAB colour space to CIE XYZ space. It assumes the
first three bands represent pixels in LAB colour space and returns an
image where the first three bands are transformed to XYZ and any
remaining bands are just copied. Pass it a RGB image by mistake and
you'll just get nonsense.</p>
<p>VIPS has a feature to help (a little) with this: it sets a
<a class="link" href="libvips-VipsImage.html#VipsInterpretation" title="enum VipsInterpretation"><span class="type">VipsInterpretation</span></a> hint for each image (see
<a class="link" href="libvips-header.html#vips-image-get-interpretation" title="vips_image_get_interpretation ()"><code class="function">vips_image_get_interpretation()</code></a>); a hint which says how pixels should
be interpreted. For example, <a class="link" href="libvips-colour.html#vips-Lab2XYZ" title="vips_Lab2XYZ ()"><code class="function">vips_Lab2XYZ()</code></a> will set the
interpretation of the output image to <a class="link" href="libvips-VipsImage.html#VIPS-INTERPRETATION-XYZ:CAPS"><span class="type">VIPS_INTERPRETATION_XYZ</span></a>. A
few utility operations will also use interpretation as a guide. For
example, you can give <a class="link" href="libvips-colour.html#vips-colourspace" title="vips_colourspace ()"><code class="function">vips_colourspace()</code></a> an input image and a desired
colourspace and it will use the input's interpretation hint to apply
the best sequence of colourspace transforms to get to the desired space.</p>
<p>Use things like <a class="link" href="libvips-arithmetic.html#vips-invert" title="vips_invert ()"><code class="function">vips_invert()</code></a> to manipulate your images. When you are done,
you can write images to disc files (with <a class="link" href="libvips-VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()"><code class="function">vips_image_write_to_file()</code></a>),
to formatted memory buffers (with <a class="link" href="libvips-VipsImage.html#vips-image-write-to-buffer" title="vips_image_write_to_buffer ()"><code class="function">vips_image_write_to_buffer()</code></a>) and to
C-style memory arrays (with <a class="link" href="libvips-VipsImage.html#vips-image-write-to-memory" title="vips_image_write_to_memory ()"><code class="function">vips_image_write_to_memory()</code></a>.</p>
<p>You can also write image to other images. Create, for example, a temporary
disc image with <a class="link" href="libvips-VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a>, then write your image to that
with <a class="link" href="libvips-VipsImage.html#vips-image-write" title="vips_image_write ()"><code class="function">vips_image_write()</code></a>. You can create several other types of image and
write to them, see <a class="link" href="libvips-VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()"><code class="function">vips_image_new_memory()</code></a>, for example. </p>
<p>See operation for an introduction to
running operations on images, see <a class="link" href="libvips-header.html" title="header">header</a> for getting and setting image
metadata. See object for a discussion of
the lower levels.</p>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="VIPS-MAGIC-INTEL:CAPS"></a><h3>VIPS_MAGIC_INTEL</h3>
<pre class="programlisting">#define VIPS_MAGIC_INTEL (0xb6a6f208U)
</pre>
<p>The first four bytes of a VIPS file in Intel byte ordering.</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-MAGIC-SPARC:CAPS"></a><h3>VIPS_MAGIC_SPARC</h3>
<pre class="programlisting">#define VIPS_MAGIC_SPARC (0x08f2a6b6U)
</pre>
<p>The first four bytes of a VIPS file in SPARC byte ordering.</p>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-MAX-COORD:CAPS"></a><h3>VIPS_MAX_COORD</h3>
<pre class="programlisting">#define VIPS_MAX_COORD (10000000)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="VipsStartFn"></a><h3>VipsStartFn ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
<span class="c_punctuation">(</span>*VipsStartFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">struct _VipsImage</span> *out</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Start a new processing sequence for this generate function. This allocates
per-thread state, such as an input region.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-start-one" title="vips_start_one ()"><code class="function">vips_start_one()</code></a>, <a class="link" href="libvips-generate.html#vips-start-many" title="vips_start_many ()"><code class="function">vips_start_many()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.5.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>image being calculated</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.5.7"></a><h4>Returns</h4>
<p> a new sequence value</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsGenerateFn"></a><h3>VipsGenerateFn ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
<span class="c_punctuation">(</span>*VipsGenerateFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">struct _VipsRegion</span> *out</code></em>,
<em class="parameter"><code><span class="type">void</span> *seq</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> *stop</code></em>);</pre>
<p>Fill <em class="parameter"><code>out->valid</code></em>
with pixels. <em class="parameter"><code>seq</code></em>
contains per-thread state, such as the
input regions. Set <em class="parameter"><code>stop</code></em>
to <code class="literal">TRUE</code> to stop processing. </p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>, <a class="link" href="libvips-generate.html#vips-stop-many" title="vips_stop_many ()"><code class="function">vips_stop_many()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.6.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p><span class="type">VipsRegion</span> to fill</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>seq</p></td>
<td class="parameter_description"><p>sequence value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stop</p></td>
<td class="parameter_description"><p>set this to stop processing</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.6.7"></a><h4>Returns</h4>
<p> 0 on success, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsStopFn"></a><h3>VipsStopFn ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
<span class="c_punctuation">(</span>*VipsStopFn<span class="c_punctuation">)</span> (<em class="parameter"><code><span class="type">void</span> *seq</code></em>,
<em class="parameter"><code><span class="type">void</span> *a</code></em>,
<em class="parameter"><code><span class="type">void</span> *b</code></em>);</pre>
<p>Stop a processing sequence. This frees
per-thread state, such as an input region.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-stop-one" title="vips_stop_one ()"><code class="function">vips_stop_one()</code></a>, <a class="link" href="libvips-generate.html#vips-stop-many" title="vips_stop_many ()"><code class="function">vips_stop_many()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.7.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>seq</p></td>
<td class="parameter_description"><p>sequence value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>a</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>user data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.7.7"></a><h4>Returns</h4>
<p> 0 on success, -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-ELEMENT:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_ELEMENT()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_ELEMENT( I )</pre>
<div class="refsect3">
<a name="id-1.3.3.8.8.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.8.5"></a><h4>Returns</h4>
<p> <code class="function">sizeof()</code> a band element.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-PEL:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_PEL()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_PEL( I )</pre>
<div class="refsect3">
<a name="id-1.3.3.8.9.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.9.5"></a><h4>Returns</h4>
<p> <code class="function">sizeof()</code> a pixel.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-SIZEOF-LINE:CAPS"></a><h3>VIPS_IMAGE_SIZEOF_LINE()</h3>
<pre class="programlisting">#define VIPS_IMAGE_SIZEOF_LINE( I )</pre>
<div class="refsect3">
<a name="id-1.3.3.8.10.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.10.5"></a><h4>Returns</h4>
<p> <code class="function">sizeof()</code> a scanline of pixels.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-N-ELEMENTS:CAPS"></a><h3>VIPS_IMAGE_N_ELEMENTS()</h3>
<pre class="programlisting">#define VIPS_IMAGE_N_ELEMENTS( I )</pre>
<div class="refsect3">
<a name="id-1.3.3.8.11.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.11.5"></a><h4>Returns</h4>
<p> The number of band elements in a scanline.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-N-PELS:CAPS"></a><h3>VIPS_IMAGE_N_PELS()</h3>
<pre class="programlisting">#define VIPS_IMAGE_N_PELS( I )</pre>
<div class="refsect3">
<a name="id-1.3.3.8.12.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.12.5"></a><h4>Returns</h4>
<p> The number of pels in an image. A 64-bit unsigned int.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-IMAGE-ADDR:CAPS"></a><h3>VIPS_IMAGE_ADDR()</h3>
<pre class="programlisting">#define VIPS_IMAGE_ADDR( I, X, Y )</pre>
<p>This macro returns a pointer to a pixel in an image, cast to a <a class="link" href="libvips-basic.html#VipsPel" title="VipsPel"><span class="type">VipsPel</span></a> *.
It only works for
images which are fully available in memory, so memory buffers and small
mapped images only.</p>
<p>If VIPS_DEBUG is defined, you get a version that checks bounds for you.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-inplace" title="vips_image_inplace ()"><code class="function">vips_image_inplace()</code></a>, <a class="link" href="libvips-VipsRegion.html#VIPS-REGION-ADDR:CAPS" title="VIPS_REGION_ADDR()"><code class="function">VIPS_REGION_ADDR()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.13.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>X</p></td>
<td class="parameter_description"><p>x coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>Y</p></td>
<td class="parameter_description"><p>y coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.13.8"></a><h4>Returns</h4>
<p> The address of pixel (<em class="parameter"><code>X</code></em>
,<em class="parameter"><code>Y</code></em>
) in <em class="parameter"><code>I</code></em>
. </p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VIPS-MATRIX:CAPS"></a><h3>VIPS_MATRIX()</h3>
<pre class="programlisting">#define VIPS_MATRIX( I, X, Y )</pre>
<p>This macro returns a pointer to a pixel in an image, cast to a double*. The
image must have a single band, be <a class="link" href="libvips-VipsImage.html#VIPS-FORMAT-DOUBLE:CAPS"><span class="type">VIPS_FORMAT_DOUBLE</span></a> and be
fully available in memory, so memory buffers and small
mapped images only.</p>
<p>If VIPS_DEBUG is defined, you get a version that checks bounds and image
type for you.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-inplace" title="vips_image_inplace ()"><code class="function">vips_image_inplace()</code></a>, <a class="link" href="libvips-error.html#vips-check-matrix" title="vips_check_matrix ()"><code class="function">vips_check_matrix()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.14.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>I</p></td>
<td class="parameter_description"><p>a <span class="type">VipsImage</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>X</p></td>
<td class="parameter_description"><p>x coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>Y</p></td>
<td class="parameter_description"><p>y coordinate</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.14.8"></a><h4>Returns</h4>
<p> The address of pixel (<em class="parameter"><code>X</code></em>
,<em class="parameter"><code>Y</code></em>
) in <em class="parameter"><code>I</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-progress-set"></a><h3>vips_progress_set ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_progress_set (<em class="parameter"><code><span class="type">gboolean</span> progress</code></em>);</pre>
<p>If set, vips will print messages about the progress of computation to
stdout. This can also be enabled with the --vips-progress option, or by
setting the environment variable VIPS_PROGRESS.</p>
<div class="refsect3">
<a name="id-1.3.3.8.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>progress</p></td>
<td class="parameter_description"><p><code class="literal">TRUE</code> to enable progress messages</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-invalidate-all"></a><h3>vips_image_invalidate_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_image_invalidate_all (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Invalidate all pixel caches on <em class="parameter"><code>image</code></em>
and any downstream images, that
is, images which depend on this image. Additionally, all operations which
depend upon this image are dropped from the VIPS operation cache. </p>
<p>You should call this function after
destructively modifying an image with something like <a class="link" href="libvips-draw.html#vips-draw-circle" title="vips_draw_circle ()"><code class="function">vips_draw_circle()</code></a>.</p>
<p>The <span class="type">“invalidate”</span> signal is emitted for all invalidated images.</p>
<p>See also: <a class="link" href="libvips-VipsRegion.html#vips-region-invalidate" title="vips_region_invalidate ()"><code class="function">vips_region_invalidate()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.16.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p><span class="type">VipsImage</span> to invalidate</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-minimise-all"></a><h3>vips_image_minimise_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_image_minimise_all (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Minimise memory use on this image and any upstream images, that is, images
which this image depends upon. This function is called automatically at the
end of a computation, but it might be useful to call at other times. </p>
<p>The <span class="type">“minimise”</span> signal is emitted for all minimised images.</p>
<div class="refsect3">
<a name="id-1.3.3.8.17.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p><span class="type">VipsImage</span> to minimise</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-set-progress"></a><h3>vips_image_set_progress ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_image_set_progress (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> progress</code></em>);</pre>
<p>vips signals evaluation progress via the <span class="type">“preeval”</span>,
<span class="type">“eval”</span> and <span class="type">“posteval”</span>
signals. Progress is signalled on the most-downstream image for which
<a class="link" href="libvips-VipsImage.html#vips-image-set-progress" title="vips_image_set_progress ()"><code class="function">vips_image_set_progress()</code></a> was called.</p>
<div class="refsect3">
<a name="id-1.3.3.8.18.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to signal progress on</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>progress</p></td>
<td class="parameter_description"><p>turn progress reporting on or off</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-filename-get-filename"></a><h3>vips_filename_get_filename ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> *
vips_filename_get_filename (<em class="parameter"><code>const <span class="type">char</span> *vips_filename</code></em>);</pre>
<p>Given a vips filename like "fred.jpg[Q=90]", return a new string of
just the filename part, "fred.jpg" in this case. </p>
<p>Useful for language bindings. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-filename-get-options" title="vips_filename_get_options ()"><code class="function">vips_filename_get_options()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.19.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>vips_filename</p></td>
<td class="parameter_description"><p>a filename including a set of options</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.19.8"></a><h4>Returns</h4>
<p> transfer full: just the filename component.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-filename-get-options"></a><h3>vips_filename_get_options ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> *
vips_filename_get_options (<em class="parameter"><code>const <span class="type">char</span> *vips_filename</code></em>);</pre>
<p>Given a vips filename like "fred.jpg[Q=90]", return a new string of
just the options part, "[Q=90]" in this case. </p>
<p>Useful for language bindings. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-filename-get-filename" title="vips_filename_get_filename ()"><code class="function">vips_filename_get_filename()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.20.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>vips_filename</p></td>
<td class="parameter_description"><p>a filename including a set of options</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.20.8"></a><h4>Returns</h4>
<p> transfer full: just the options component.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new"></a><h3>vips_image_new ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>vips_image_new() creates a new, empty <span class="type">VipsImage</span>.
If you write to one of these images, vips will just attach some callbacks,
no pixels will be generated. </p>
<p>Write pixels to an image with <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a> or
<a class="link" href="libvips-VipsImage.html#vips-image-write-line" title="vips_image_write_line ()"><code class="function">vips_image_write_line()</code></a>. Write a whole image to another image with
<a class="link" href="libvips-VipsImage.html#vips-image-write" title="vips_image_write ()"><code class="function">vips_image_write()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.21.6"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-memory"></a><h3>vips_image_new_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_memory (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>vips_image_new_memory() creates a new <span class="type">VipsImage</span> which, when written to, will
create a memory image. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.22.6"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-memory"></a><h3>vips_image_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_memory (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>A renamed <a class="link" href="libvips-VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()"><code class="function">vips_image_new_memory()</code></a> ... Some gobject binding systems do not
like more than one <code class="function">_new()</code> method.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-memory" title="vips_image_new_memory ()"><code class="function">vips_image_new_memory()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.23.6"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-file"></a><h3>vips_image_new_from_file ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_file (<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Optional arguments:</p>
<p><em class="parameter"><code>access</code></em>
: hint <a class="link" href="libvips-VipsImage.html#VipsAccess" title="enum VipsAccess"><span class="type">VipsAccess</span></a> mode to loader
<em class="parameter"><code>disc</code></em>
: load via a temporary disc file</p>
<p>vips_image_new_from_file() opens <em class="parameter"><code>name</code></em>
for reading. It can load files
in many image formats, including VIPS, TIFF, PNG, JPEG, FITS, Matlab,
OpenEXR, CSV, WebP, Radiance, RAW, PPM and others. </p>
<p>Load options may be appended to <em class="parameter"><code>filename</code></em>
as "[name=value,...]" or given as
a NULL-terminated list of name-value pairs at the end of the arguments.
Options given in the function call override options given in the filename.
Many loaders add extra options, see <a class="link" href="libvips-VipsForeignSave.html#vips-jpegload" title="vips_jpegload ()"><code class="function">vips_jpegload()</code></a>, for example. </p>
<p>vips_image_new_from_file() always returns immediately with the header
fields filled in. No pixels are actually read until you first access them. </p>
<p><em class="parameter"><code>access</code></em>
lets you set a <a class="link" href="libvips-VipsImage.html#VipsAccess" title="enum VipsAccess"><span class="type">VipsAccess</span></a> hint giving the expected access pattern
for this file.
<a class="link" href="libvips-VipsImage.html#VIPS-ACCESS-RANDOM:CAPS"><span class="type">VIPS_ACCESS_RANDOM</span></a> means you can fetch pixels randomly from the image.
This is the default mode. <a class="link" href="libvips-VipsImage.html#VIPS-ACCESS-SEQUENTIAL:CAPS"><span class="type">VIPS_ACCESS_SEQUENTIAL</span></a> means you will read the
whole image exactly once, top-to-bottom. In this mode, vips can avoid
converting the whole image in one go, for a large memory saving. You are
allowed to make small non-local references, so area operations like
convolution will work. <a class="link" href="libvips-VipsImage.html#VIPS-ACCESS-SEQUENTIAL-UNBUFFERED:CAPS"><span class="type">VIPS_ACCESS_SEQUENTIAL_UNBUFFERED</span></a> does not allow
non-local references, so will only work for very strict top-to-bottom
operations, but does have very low memory needs. </p>
<p>In <a class="link" href="libvips-VipsImage.html#VIPS-ACCESS-RANDOM:CAPS"><span class="type">VIPS_ACCESS_RANDOM</span></a> mode, small images are decompressed to memory and
then processed from there. Large images are decompressed to temporary
random-access files on disc and then processed from there. Set <em class="parameter"><code>disc</code></em>
to
<code class="literal">TRUE</code> to force loading via disc. See <a class="link" href="libvips-VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a> for an
explanation of how VIPS selects a location for the temporary file.</p>
<p>The disc threshold can be set with the "--vips-disc-threshold"
command-line argument, or the VIPS_DISC_THRESHOLD environment variable.
The value is a simple integer, but can take a unit postfix of "k",
"m" or "g" to indicate kilobytes, megabytes or gigabytes.
The default threshold is 100 MB.</p>
<p>For example:</p>
<div class="informalexample"><pre class="programlisting">
VipsImage *image = vips_image_new_from_file ("fred.tif",
"page", 12,
NULL);
</pre></div>
<p></p>
<p>Will open "fred.tif", reading page 12. </p>
<div class="informalexample"><pre class="programlisting">
VipsImage *image = vips_image_new_from_file ("fred.jpg[shrink=2]",
NULL);
</pre></div>
<p></p>
<p>Will open "fred.jpg", downsampling by a factor of two. </p>
<p>Use <a class="link" href="libvips-VipsForeignSave.html#vips-foreign-find-load" title="vips_foreign_find_load ()"><code class="function">vips_foreign_find_load()</code></a> or <a class="link" href="libvips-VipsForeignSave.html#vips-foreign-is-a" title="vips_foreign_is_a ()"><code class="function">vips_foreign_is_a()</code></a> to see what format a
file is in and therefore what options are available. If you need more
control over the loading process, you can call loaders directly, see
<a class="link" href="libvips-VipsForeignSave.html#vips-jpegload" title="vips_jpegload ()"><code class="function">vips_jpegload()</code></a>, for example. </p>
<p>See also: <a class="link" href="libvips-VipsForeignSave.html#vips-foreign-find-load" title="vips_foreign_find_load ()"><code class="function">vips_foreign_find_load()</code></a>, <a class="link" href="libvips-VipsForeignSave.html#vips-foreign-is-a" title="vips_foreign_is_a ()"><code class="function">vips_foreign_is_a()</code></a>,
<a class="link" href="libvips-VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()"><code class="function">vips_image_write_to_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.24.21"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>file to open</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of optional named arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.24.22"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-file-RW"></a><h3>vips_image_new_from_file_RW ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_file_RW (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>Opens the named file for simultaneous reading and writing. This will only
work for VIPS files in a format native to your machine. It is only for
paintbox-type applications.</p>
<p>See also: <a class="link" href="libvips-draw.html#vips-draw-circle" title="vips_draw_circle ()"><code class="function">vips_draw_circle()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.25.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>filename to open</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.25.7"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-file-raw"></a><h3>vips_image_new_from_file_raw ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_file_raw (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code><span class="type">int</span> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><span class="type">guint64</span> offset</code></em>);</pre>
<p>This function maps the named file and returns a <span class="type">VipsImage</span> you can use to
read it.</p>
<p>It returns an 8-bit image with <em class="parameter"><code>bands</code></em>
bands. If the image is not 8-bit, use
<a class="link" href="libvips-conversion.html#vips-copy" title="vips_copy ()"><code class="function">vips_copy()</code></a> to transform the descriptor after loading it.</p>
<p>See also: <a class="link" href="libvips-conversion.html#vips-copy" title="vips_copy ()"><code class="function">vips_copy()</code></a>, <a class="link" href="libvips-VipsForeignSave.html#vips-rawload" title="vips_rawload ()"><code class="function">vips_rawload()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.26.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>filename to open</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>xsize</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ysize</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bands</p></td>
<td class="parameter_description"><p>image bands (or bytes per pixel)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>offset</p></td>
<td class="parameter_description"><p>bytes to skip at start of file</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.26.8"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-memory"></a><h3>vips_image_new_from_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_memory (<em class="parameter"><code>const <span class="type">void</span> *data</code></em>,
<em class="parameter"><code><span class="type">size_t</span> size</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>This function wraps a <span class="type">VipsImage</span> around a memory area. The memory area
must be a simple array, for example RGBRGBRGB, left-to-right,
top-to-bottom. Use <a class="link" href="libvips-VipsImage.html#vips-image-new-from-buffer" title="vips_image_new_from_buffer ()"><code class="function">vips_image_new_from_buffer()</code></a> to load an area of memory
containing an image in a format.</p>
<p>VIPS does not take
responsibility for the area of memory, it's up to you to make sure it's
freed when the image is closed. See for example <span class="type">“close”</span>.</p>
<p>Because VIPS is "borrowing" <em class="parameter"><code>data</code></em>
from the caller, this function is
extremely dangerous. Unless you are very careful, you will get crashes or
memory corruption. Use <a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory-copy" title="vips_image_new_from_memory_copy ()"><code class="function">vips_image_new_from_memory_copy()</code></a> instead if you are
at all unsure. </p>
<p>Use <a class="link" href="libvips-conversion.html#vips-copy" title="vips_copy ()"><code class="function">vips_copy()</code></a> to set other image properties. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-write-to-memory" title="vips_image_write_to_memory ()"><code class="function">vips_image_write_to_memory()</code></a>,
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory-copy" title="vips_image_new_from_memory_copy ()"><code class="function">vips_image_new_from_memory_copy()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.27.9"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> start of memory area. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>length of memory area</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bands</p></td>
<td class="parameter_description"><p>image bands (or bytes per pixel)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>image format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.27.10"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-memory-copy"></a><h3>vips_image_new_from_memory_copy ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_memory_copy (<em class="parameter"><code>const <span class="type">void</span> *data</code></em>,
<em class="parameter"><code><span class="type">size_t</span> size</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> bands</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Like <a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory" title="vips_image_new_from_memory ()"><code class="function">vips_image_new_from_memory()</code></a>, but VIPS will make a copy of the memory
area. This
means more memory use and an extra copy operation, but is much simpler and
safer. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory" title="vips_image_new_from_memory ()"><code class="function">vips_image_new_from_memory()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.28.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> start of memory area. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>length of memory area</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bands</p></td>
<td class="parameter_description"><p>image bands (or bytes per pixel)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>image format</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.28.7"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-from-buffer"></a><h3>vips_image_new_from_buffer ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_from_buffer (<em class="parameter"><code>const <span class="type">void</span> *buf</code></em>,
<em class="parameter"><code><span class="type">size_t</span> len</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *option_string</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Loads an image from the formatted area of memory <em class="parameter"><code>buf</code></em>
, <em class="parameter"><code>len</code></em>
using the
loader recommended by <a class="link" href="libvips-VipsForeignSave.html#vips-foreign-find-load-buffer" title="vips_foreign_find_load_buffer ()"><code class="function">vips_foreign_find_load_buffer()</code></a>. Only TIFF, PNG and
JPEG formats are supported. To load an unformatted area of memory, use
<a class="link" href="libvips-VipsImage.html#vips-image-new-from-memory" title="vips_image_new_from_memory ()"><code class="function">vips_image_new_from_memory()</code></a>. </p>
<p>VIPS does not take
responsibility for the area of memory, it's up to you to make sure it's
freed when the image is closed. See for example <span class="type">“close”</span>.</p>
<p>Load options may be given in <em class="parameter"><code>option_string</code></em>
as "[name=value,...]" or given as
a NULL-terminated list of name-value pairs at the end of the arguments.
Options given in the function call override options given in the filename. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-write-to-buffer" title="vips_image_write_to_buffer ()"><code class="function">vips_image_write_to_buffer()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.29.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p> image data. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=len][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>length of memory buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>option_string</p></td>
<td class="parameter_description"><p>set of extra options as a string</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of optional named arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.29.9"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-matrix"></a><h3>vips_image_new_matrix ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_matrix (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>);</pre>
<p>This convenience function makes an image which is a matrix: a one-band
<a class="link" href="libvips-VipsImage.html#VIPS-FORMAT-DOUBLE:CAPS"><span class="type">VIPS_FORMAT_DOUBLE</span></a> image held in memory.</p>
<p>Use <a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>, or <a class="link" href="libvips-VipsImage.html#VIPS-MATRIX:CAPS" title="VIPS_MATRIX()"><code class="function">VIPS_MATRIX()</code></a> to address pixels in the image.</p>
<p>Use <a class="link" href="libvips-header.html#vips-image-set-double" title="vips_image_set_double ()"><code class="function">vips_image_set_double()</code></a> to set "scale" and "offset", if required. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-matrixv" title="vips_image_new_matrixv ()"><code class="function">vips_image_new_matrixv()</code></a></p>
<div class="refsect3">
<a name="id-1.3.3.8.30.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.30.9"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-matrixv"></a><h3>vips_image_new_matrixv ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_matrixv (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>As <a class="link" href="libvips-VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()"><code class="function">vips_image_new_matrix()</code></a>, but initialise the matrix from the argument
list. After <em class="parameter"><code>height</code></em>
should be <em class="parameter"><code>width</code></em>
* <em class="parameter"><code>height</code></em>
double constants which are
used to set the matrix elements. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-matrix" title="vips_image_new_matrix ()"><code class="function">vips_image_new_matrix()</code></a></p>
<div class="refsect3">
<a name="id-1.3.3.8.31.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>matrix coefficients</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.31.7"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-matrix-from-array"></a><h3>vips_image_new_matrix_from_array ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_matrix_from_array (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code>const <span class="type">double</span> *array</code></em>,
<em class="parameter"><code><span class="type">int</span> size</code></em>);</pre>
<p>A binding-friendly version of <a class="link" href="libvips-VipsImage.html#vips-image-new-matrixv" title="vips_image_new_matrixv ()"><code class="function">vips_image_new_matrixv()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.32.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>array</p></td>
<td class="parameter_description"><p> array of elements. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>number of elements</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.32.6"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-matrix-from-array"></a><h3>vips_image_matrix_from_array ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_matrix_from_array (<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code>const <span class="type">double</span> *array</code></em>,
<em class="parameter"><code><span class="type">int</span> size</code></em>);</pre>
<p>A renamed <a class="link" href="libvips-VipsImage.html#vips-image-new-matrix-from-array" title="vips_image_new_matrix_from_array ()"><code class="function">vips_image_new_matrix_from_array()</code></a>. Some gobject bindings do not
like more than one _new method.</p>
<div class="refsect3">
<a name="id-1.3.3.8.33.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>image width</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>image height</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>array</p></td>
<td class="parameter_description"><p> array of elements. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>number of elements</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.33.6"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-set-delete-on-close"></a><h3>vips_image_set_delete_on_close ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_image_set_delete_on_close (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> delete_on_close</code></em>);</pre>
<p>Sets the delete_on_close flag for the image. If this flag is set, when
<em class="parameter"><code>image</code></em>
is finalized, the filename held in <em class="parameter"><code>image->filename</code></em>
at the time of
this call is deleted.</p>
<p>This function is clearly extremely dangerous, use with great caution.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.34.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>delete_on_close</p></td>
<td class="parameter_description"><p>format of file</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-get-disc-threshold"></a><h3>vips_get_disc_threshold ()</h3>
<pre class="programlisting"><span class="returnvalue">guint64</span>
vips_get_disc_threshold (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Return the number of bytes at which we flip between open via memory and
open via disc. This defaults to 100mb, but can be changed with the
VIPS_DISC_THRESHOLD environment variable or the --vips-disc-threshold
command-line flag. See <a class="link" href="libvips-VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.35.5"></a><h4>Returns</h4>
<p> disc threshold in bytes.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-new-temp-file"></a><h3>vips_image_new_temp_file ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_new_temp_file (<em class="parameter"><code>const <span class="type">char</span> *format</code></em>);</pre>
<p>Make a <span class="type">VipsImage</span> which, when written to, will create a temporary file on
disc. The file will be automatically deleted when the image is destroyed.
<em class="parameter"><code>format</code></em>
is something like "%s.v" for a vips file.</p>
<p>The file is created in the temporary directory. This is set with the
environment variable TMPDIR. If this is not set, then on Unix systems, vips
will default to /tmp. On Windows, vips uses <code class="function">GetTempPath()</code> to find the
temporary directory. </p>
<p>vips uses <code class="function">g_mkstemp()</code> to make the temporary filename. They generally look
something like "vips-12-EJKJFGH.v".</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.36.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format of file</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.36.9"></a><h4>Returns</h4>
<p> the new <span class="type">VipsImage</span>, or <code class="literal">NULL</code> on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write"></a><h3>vips_image_write ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_write (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>,
<em class="parameter"><code><span class="type">VipsImage</span> *out</code></em>);</pre>
<p>Write <em class="parameter"><code>image</code></em>
to <em class="parameter"><code>out</code></em>
. Use <a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a> and friends to create the
<span class="type">VipsImage</span> you want to write to.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new" title="vips_image_new ()"><code class="function">vips_image_new()</code></a>, <a class="link" href="libvips-conversion.html#vips-copy" title="vips_copy ()"><code class="function">vips_copy()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-write-to-file" title="vips_image_write_to_file ()"><code class="function">vips_image_write_to_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.37.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>write to this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.37.7"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-to-file"></a><h3>vips_image_write_to_file ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_write_to_file (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Writes <em class="parameter"><code>in</code></em>
to <em class="parameter"><code>name</code></em>
using the saver recommended by
<a class="link" href="libvips-VipsForeignSave.html#vips-foreign-find-save" title="vips_foreign_find_save ()"><code class="function">vips_foreign_find_save()</code></a>. </p>
<p>Save options may be appended to <em class="parameter"><code>filename</code></em>
as "[name=value,...]" or given as
a NULL-terminated list of name-value pairs at the end of the arguments.
Options given in the function call override options given in the filename. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-new-from-file" title="vips_image_new_from_file ()"><code class="function">vips_image_new_from_file()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.38.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>write to this file</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of optional named arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.38.8"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-to-buffer"></a><h3>vips_image_write_to_buffer ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_write_to_buffer (<em class="parameter"><code><span class="type">VipsImage</span> *in</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *suffix</code></em>,
<em class="parameter"><code><span class="type">void</span> **buf</code></em>,
<em class="parameter"><code><span class="type">size_t</span> *size</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Writes <em class="parameter"><code>in</code></em>
to a memory buffer in a format specified by <em class="parameter"><code>suffix</code></em>
. </p>
<p>Save options may be appended to <em class="parameter"><code>suffix</code></em>
as "[name=value,...]" or given as
a NULL-terminated list of name-value pairs at the end of the arguments.
Options given in the function call override options given in the filename. </p>
<p>Currently only TIFF, JPEG and PNG formats are supported.</p>
<p>You can call the various save operations directly if you wish, see
<a class="link" href="libvips-VipsForeignSave.html#vips-jpegsave-buffer" title="vips_jpegsave_buffer ()"><code class="function">vips_jpegsave_buffer()</code></a>, for example. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-write-to-memory" title="vips_image_write_to_memory ()"><code class="function">vips_image_write_to_memory()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-new-from-buffer" title="vips_image_new_from_buffer ()"><code class="function">vips_image_new_from_buffer()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.39.9"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>image to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>suffix</p></td>
<td class="parameter_description"><p>format to write </p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p> return buffer start here. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>return buffer length here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of optional named arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.39.10"></a><h4>Returns</h4>
<p> 0 on success, -1 on error</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-to-memory"></a><h3>vips_image_write_to_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> *
vips_image_write_to_memory (<em class="parameter"><code><span class="type">VipsImage</span> *in</code></em>,
<em class="parameter"><code><span class="type">size_t</span> *size</code></em>);</pre>
<p>Writes <em class="parameter"><code>in</code></em>
to memory as a simple, unformatted C-style array. </p>
<p>The caller is responsible for freeing this memory. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-write-to-buffer" title="vips_image_write_to_buffer ()"><code class="function">vips_image_write_to_buffer()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.40.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>image to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>return buffer length here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.40.8"></a><h4>Returns</h4>
<p> return buffer start here. </p>
<p><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-decode-predict"></a><h3>vips_image_decode_predict ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_decode_predict (<em class="parameter"><code><span class="type">VipsImage</span> *in</code></em>,
<em class="parameter"><code><span class="type">int</span> *bands</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> *format</code></em>);</pre>
<p>We often need to know what an image will decode to without actually
decoding it, for example, in arg checking.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-decode" title="vips_image_decode ()"><code class="function">vips_image_decode()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.41.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>image to decode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>bands</p></td>
<td class="parameter_description"><p>predict bands here</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>predict format here</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-decode"></a><h3>vips_image_decode ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_decode (<em class="parameter"><code><span class="type">VipsImage</span> *in</code></em>,
<em class="parameter"><code><span class="type">VipsImage</span> **out</code></em>);</pre>
<p>A convenience function to unpack to a format that we can compute with.
<em class="parameter"><code>out.coding</code></em>
is always <a class="link" href="libvips-VipsImage.html#VIPS-CODING-NONE:CAPS"><span class="type">VIPS_CODING_NONE</span></a>. </p>
<p>This unpacks LABQ to plain LAB. Use <a class="link" href="libvips-colour.html#vips-LabQ2LabS" title="vips_LabQ2LabS ()"><code class="function">vips_LabQ2LabS()</code></a> for a bit more speed
if you need it. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-encode" title="vips_image_encode ()"><code class="function">vips_image_encode()</code></a>, <a class="link" href="libvips-colour.html#vips-LabQ2Lab" title="vips_LabQ2Lab ()"><code class="function">vips_LabQ2Lab()</code></a>, <a class="link" href="libvips-colour.html#vips-rad2float" title="vips_rad2float ()"><code class="function">vips_rad2float()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.42.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>image to decode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>write to this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.42.8"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-encode"></a><h3>vips_image_encode ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_encode (<em class="parameter"><code><span class="type">VipsImage</span> *in</code></em>,
<em class="parameter"><code><span class="type">VipsImage</span> **out</code></em>,
<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsCoding" title="enum VipsCoding"><span class="type">VipsCoding</span></a> coding</code></em>);</pre>
<p>A convenience function to pack to a coding. The inverse of
<a class="link" href="libvips-VipsImage.html#vips-image-decode" title="vips_image_decode ()"><code class="function">vips_image_decode()</code></a>.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-decode" title="vips_image_decode ()"><code class="function">vips_image_decode()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.43.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>in</p></td>
<td class="parameter_description"><p>image to encode</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>out</p></td>
<td class="parameter_description"><p>write to this image</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>coding</p></td>
<td class="parameter_description"><p>coding to apply</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.43.7"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-isMSBfirst"></a><h3>vips_image_isMSBfirst ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_image_isMSBfirst (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>image</code></em>
is in most-significant-
byte first form. This is the byte order used on the SPARC
architecture and others.</p>
<div class="refsect3">
<a name="id-1.3.3.8.44.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-isfile"></a><h3>vips_image_isfile ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_image_isfile (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>image</code></em>
represents a file on disc in some way.</p>
<div class="refsect3">
<a name="id-1.3.3.8.45.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-ispartial"></a><h3>vips_image_ispartial ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_image_ispartial (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>im</code></em>
represents a partial image (a delayed calculation).</p>
<div class="refsect3">
<a name="id-1.3.3.8.46.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-copy-memory"></a><h3>vips_image_copy_memory ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> *
vips_image_copy_memory (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Allocate a memory buffer and copy <em class="parameter"><code>image</code></em>
to it. This is a thread-safe
equivalent of <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a>, useful if <em class="parameter"><code>image</code></em>
is small and from an
unknown source.</p>
<p>If <em class="parameter"><code>image</code></em>
is already in memory (perhaps a mmaped file on disc),
<a class="link" href="libvips-VipsImage.html#vips-image-copy-memory" title="vips_image_copy_memory ()"><code class="function">vips_image_copy_memory()</code></a> will just ref <em class="parameter"><code>image</code></em>
and return that.</p>
<p>If you are sure that <em class="parameter"><code>image</code></em>
is not shared with another thread (perhaps you
have made it yourself), use <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a> instead.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.47.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to copy to a memory buffer</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-wio-input"></a><h3>vips_image_wio_input ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_wio_input (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Check that an image is readable via the <a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a> macro, that is,
that the entire image is in memory and all pixels can be read with
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>. If it
isn't, try to transform it so that <a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a> can work. </p>
<p>Since this function modifies <em class="parameter"><code>image</code></em>
, it is not thread-safe. Only call it on
images which you are sure have not been shared with another thread. If the
image might have been shared, use the less efficient
<a class="link" href="libvips-VipsImage.html#vips-image-copy-memory" title="vips_image_copy_memory ()"><code class="function">vips_image_copy_memory()</code></a> instead.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-copy-memory" title="vips_image_copy_memory ()"><code class="function">vips_image_copy_memory()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-pio-input" title="vips_image_pio_input ()"><code class="function">vips_image_pio_input()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-inplace" title="vips_image_inplace ()"><code class="function">vips_image_inplace()</code></a>, <a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.48.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to transform</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.48.8"></a><h4>Returns</h4>
<p> 0 on succeess, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-pio-input"></a><h3>vips_image_pio_input ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_pio_input (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Check that an image is readable with <a class="link" href="libvips-VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> and friends.
If it isn't, try to transform the image so that <a class="link" href="libvips-VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a> can
work.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-pio-output" title="vips_image_pio_output ()"><code class="function">vips_image_pio_output()</code></a>, <a class="link" href="libvips-VipsRegion.html#vips-region-prepare" title="vips_region_prepare ()"><code class="function">vips_region_prepare()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.49.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to check</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.49.7"></a><h4>Returns</h4>
<p> 0 on succeess, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-pio-output"></a><h3>vips_image_pio_output ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_pio_output (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Check that an image is writeable with <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>. If it isn't,
try to transform the image so that <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a> can work.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-image-pio-input" title="vips_image_pio_input ()"><code class="function">vips_image_pio_input()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.50.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to check</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.50.7"></a><h4>Returns</h4>
<p> 0 on succeess, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-inplace"></a><h3>vips_image_inplace ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_inplace (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Gets <em class="parameter"><code>image</code></em>
ready for an in-place operation, such as <a class="link" href="libvips-draw.html#vips-draw-circle" title="vips_draw_circle ()"><code class="function">vips_draw_circle()</code></a>.
After calling this function you can both read and write the image with
<a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-ADDR:CAPS" title="VIPS_IMAGE_ADDR()"><code class="function">VIPS_IMAGE_ADDR()</code></a>.</p>
<p>Since this function modifies <em class="parameter"><code>image</code></em>
, it is not thread-safe. Only call it on
images which you are sure have not been shared with another thread.
All in-place operations are inherently not thread-safe, so you need to take
great care in any case.</p>
<p>See also: <a class="link" href="libvips-draw.html#vips-draw-circle" title="vips_draw_circle ()"><code class="function">vips_draw_circle()</code></a>, <a class="link" href="libvips-VipsImage.html#vips-image-wio-input" title="vips_image_wio_input ()"><code class="function">vips_image_wio_input()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.51.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to make read-write</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.51.8"></a><h4>Returns</h4>
<p> 0 on succeess, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-prepare"></a><h3>vips_image_write_prepare ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_write_prepare (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Call this after setting header fields (width, height, and so on) to
allocate resources ready for writing. </p>
<p>Normally this function is called for you by <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a> or
<a class="link" href="libvips-VipsImage.html#vips-image-write-line" title="vips_image_write_line ()"><code class="function">vips_image_write_line()</code></a>. You will need to call it yourself if you plan to
write directly to the ->data member of a memory image.</p>
<div class="refsect3">
<a name="id-1.3.3.8.52.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to prepare</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.52.7"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-image-write-line"></a><h3>vips_image_write_line ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_image_write_line (<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>,
<em class="parameter"><code><span class="type">int</span> ypos</code></em>,
<em class="parameter"><code><a class="link" href="libvips-basic.html#VipsPel" title="VipsPel"><span class="type">VipsPel</span></a> *linebuffer</code></em>);</pre>
<p>Write a line of pixels to an image. This function must be called repeatedly
with <em class="parameter"><code>ypos</code></em>
increasing from 0 to <span class="type">“height”</span> .
<em class="parameter"><code>linebuffer</code></em>
must be <a class="link" href="libvips-VipsImage.html#VIPS-IMAGE-SIZEOF-LINE:CAPS" title="VIPS_IMAGE_SIZEOF_LINE()"><code class="function">VIPS_IMAGE_SIZEOF_LINE()</code></a> bytes long.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.53.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>image to write to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ypos</p></td>
<td class="parameter_description"><p>vertical position of scan-line to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>linebuffer</p></td>
<td class="parameter_description"><p>scanline of pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.53.7"></a><h4>Returns</h4>
<p> 0 on success, or -1 on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isint"></a><h3>vips_band_format_isint ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_band_format_isint (<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em>
is one of the integer types.</p>
<div class="refsect3">
<a name="id-1.3.3.8.54.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isuint"></a><h3>vips_band_format_isuint ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_band_format_isuint (<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em>
is one of the unsigned integer types.</p>
<div class="refsect3">
<a name="id-1.3.3.8.55.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-is8bit"></a><h3>vips_band_format_is8bit ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_band_format_is8bit (<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em>
is uchar or schar.</p>
<div class="refsect3">
<a name="id-1.3.3.8.56.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-isfloat"></a><h3>vips_band_format_isfloat ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_band_format_isfloat (<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>format</code></em>
is one of the float types.</p>
<div class="refsect3">
<a name="id-1.3.3.8.57.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-band-format-iscomplex"></a><h3>vips_band_format_iscomplex ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
vips_band_format_iscomplex (<em class="parameter"><code><a class="link" href="libvips-VipsImage.html#VipsBandFormat" title="enum VipsBandFormat"><span class="type">VipsBandFormat</span></a> format</code></em>);</pre>
<p>Return <code class="literal">TRUE</code> if <em class="parameter"><code>fmt</code></em>
is one of the complex types.</p>
<div class="refsect3">
<a name="id-1.3.3.8.58.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>format to test</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-system"></a><h3>vips_system ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>
vips_system (<em class="parameter"><code>const <span class="type">char</span> *cmd_format</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Optional arguments:</p>
<p><em class="parameter"><code>in</code></em>
: array of input images
<em class="parameter"><code>out</code></em>
: output image
<em class="parameter"><code>in_format</code></em>
: write input files like this
<em class="parameter"><code>out_format</code></em>
: write output filename like this
<em class="parameter"><code>log</code></em>
: stdout of command is returned here</p>
<p>vips_system() runs a command, optionally passing a set of images in and
optionally getting an image back. The command's stdout is returned in <em class="parameter"><code>log</code></em>
. </p>
<p>First, if <em class="parameter"><code>in</code></em>
is set, the array of images are written to files. See
<a class="link" href="libvips-VipsImage.html#vips-image-new-temp-file" title="vips_image_new_temp_file ()"><code class="function">vips_image_new_temp_file()</code></a> to see how temporary files are created.
If <em class="parameter"><code>in_format</code></em>
is
something like %s.png, the file will be written in PNG format. By
default, <em class="parameter"><code>in_format</code></em>
is %s.tif. </p>
<p>If <em class="parameter"><code>out_format</code></em>
is set, an output filename is formed in the same way.</p>
<p>The command string to run is made by substituting the first set of %s
in <em class="parameter"><code>cmd_format</code></em>
for the names of the input files, if <em class="parameter"><code>in</code></em>
is set, and then
the next %s for the output filename, if <em class="parameter"><code>out_format</code></em>
is set.
You can put a number between the % and the s to change the order
in which the substitution occurs.</p>
<p>The command is executed with <code class="function">popen()</code> and the output captured in <em class="parameter"><code>log</code></em>
. </p>
<p>After the command finishes, if <em class="parameter"><code>out_format</code></em>
is set, the output image is
opened and returned in <em class="parameter"><code>out</code></em>
.
Closing <em class="parameter"><code>out</code></em>
image will automatically delete the output file.</p>
<p>Finally the input images are deleted. </p>
<p>For example, this call will run the ImageMagick convert program on an
image, using JPEG files to pass images into and out of the convert command.</p>
<div class="informalexample"><pre class="programlisting">
VipsArrayImage *in;
VipsImage *out;
char *log;
if (vips_system ("convert %s -swirl 45 %s",
"in", in,
"out", &out,
"in_format", "%s.jpg",
"out_format", "%s.jpg",
"log", &log,
NULL))
error ...
</pre></div>
<p></p>
<div class="refsect3">
<a name="id-1.3.3.8.59.16"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>cmd_format</p></td>
<td class="parameter_description"><p>command to run</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p><code class="literal">NULL</code>-terminated list of optional named arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.59.17"></a><h4>Returns</h4>
<p> 0 on success, -1 on failure. </p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-array-image-new"></a><h3>vips_array_image_new ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsArrayImage</span> *
vips_array_image_new (<em class="parameter"><code><span class="type">VipsImage</span> **array</code></em>,
<em class="parameter"><code><span class="type">int</span> n</code></em>);</pre>
<p>Allocate a new array of images and copy <em class="parameter"><code>array</code></em>
into it. Free with
<a class="link" href="libvips-type.html#vips-area-unref" title="vips_area_unref ()"><code class="function">vips_area_unref()</code></a>. </p>
<p>The images will all be reffed by this function. They
will be automatically unreffed for you by
<a class="link" href="libvips-type.html#vips-area-unref" title="vips_area_unref ()"><code class="function">vips_area_unref()</code></a>.</p>
<p>Add an extra NULL element at the end, handy for eg.
<a class="link" href="libvips-generate.html#vips-image-pipeline-array" title="vips_image_pipeline_array ()"><code class="function">vips_image_pipeline_array()</code></a> etc. </p>
<p>See also: <span class="type">VipsArea</span>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.60.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>array</p></td>
<td class="parameter_description"><p> array of <span class="type">VipsImage</span>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>number of images</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.60.9"></a><h4>Returns</h4>
<p> A new <span class="type">VipsArrayImage</span>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-array-image-newv"></a><h3>vips_array_image_newv ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsArrayImage</span> *
vips_array_image_newv (<em class="parameter"><code><span class="type">int</span> n</code></em>,
<em class="parameter"><code>...</code></em>);</pre>
<p>Allocate a new array of <em class="parameter"><code>n</code></em>
<span class="type">VipsImage</span> and copy @... into it. Free with
<a class="link" href="libvips-type.html#vips-area-unref" title="vips_area_unref ()"><code class="function">vips_area_unref()</code></a>. </p>
<p>The images will all be reffed by this function. They
will be automatically unreffed for you by
<a class="link" href="libvips-type.html#vips-area-unref" title="vips_area_unref ()"><code class="function">vips_area_unref()</code></a>.</p>
<p>Add an extra NULL element at the end, handy for eg.
<a class="link" href="libvips-generate.html#vips-image-pipeline-array" title="vips_image_pipeline_array ()"><code class="function">vips_image_pipeline_array()</code></a> etc. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-array-image-new" title="vips_array_image_new ()"><code class="function">vips_array_image_new()</code></a></p>
<div class="refsect3">
<a name="id-1.3.3.8.61.8"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>number of images</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>list of <span class="type">VipsImage</span> arguments</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.61.9"></a><h4>Returns</h4>
<p> A new <span class="type">VipsArrayImage</span>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-array-image-empty"></a><h3>vips_array_image_empty ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsArrayImage</span> *
vips_array_image_empty (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Make an empty image array.
Handy with <code class="function">vips_array_image_add()</code> for bindings
which can't handle object array arguments.</p>
<p>See also: <code class="function">vips_array_image_add()</code>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.62.6"></a><h4>Returns</h4>
<p> A new <span class="type">VipsArrayImage</span>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-array-image-append"></a><h3>vips_array_image_append ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsArrayImage</span> *
vips_array_image_append (<em class="parameter"><code><span class="type">VipsArrayImage</span> *array</code></em>,
<em class="parameter"><code><span class="type">VipsImage</span> *image</code></em>);</pre>
<p>Make a new <span class="type">VipsArrayImage</span>, one larger than <em class="parameter"><code>array</code></em>
, with <em class="parameter"><code>image</code></em>
appended
to the end.
Handy with <a class="link" href="libvips-VipsImage.html#vips-array-image-empty" title="vips_array_image_empty ()"><code class="function">vips_array_image_empty()</code></a> for bindings
which can't handle object array arguments.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-array-image-empty" title="vips_array_image_empty ()"><code class="function">vips_array_image_empty()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.63.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>array</p></td>
<td class="parameter_description"><p> append to this. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>image</p></td>
<td class="parameter_description"><p>add this</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.63.7"></a><h4>Returns</h4>
<p> A new <span class="type">VipsArrayImage</span>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-array-image-get"></a><h3>vips_array_image_get ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> **
vips_array_image_get (<em class="parameter"><code><span class="type">VipsArrayImage</span> *array</code></em>,
<em class="parameter"><code><span class="type">int</span> *n</code></em>);</pre>
<p>Fetch an image array from a <span class="type">VipsArrayImage</span>. Useful for language bindings.</p>
<div class="refsect3">
<a name="id-1.3.3.8.64.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>array</p></td>
<td class="parameter_description"><p>the <span class="type">VipsArrayImage</span> to fetch from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>length of array</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.64.6"></a><h4>Returns</h4>
<p> array of <span class="type">VipsImage</span>. </p>
<p><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-value-get-array-image"></a><h3>vips_value_get_array_image ()</h3>
<pre class="programlisting"><span class="returnvalue">VipsImage</span> **
vips_value_get_array_image (<em class="parameter"><code>const <span class="type">GValue</span> *value</code></em>,
<em class="parameter"><code><span class="type">int</span> *n</code></em>);</pre>
<p>Return the start of the array of images held by <em class="parameter"><code>value</code></em>
.
optionally return the number of elements in <em class="parameter"><code>n</code></em>
.</p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-value-set-array-image" title="vips_value_set_array_image ()"><code class="function">vips_value_set_array_image()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.65.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p><code class="literal">GValue</code> to get from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p> return the number of elements here, optionally. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.8.65.7"></a><h4>Returns</h4>
<p> The array address. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="vips-value-set-array-image"></a><h3>vips_value_set_array_image ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
vips_value_set_array_image (<em class="parameter"><code><span class="type">GValue</span> *value</code></em>,
<em class="parameter"><code><span class="type">int</span> n</code></em>);</pre>
<p>Set <em class="parameter"><code>value</code></em>
to hold an array of images. Pass in the array length in <em class="parameter"><code>n</code></em>
. </p>
<p>See also: <a class="link" href="libvips-VipsImage.html#vips-array-image-get" title="vips_array_image_get ()"><code class="function">vips_array_image_get()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.8.66.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p> <code class="literal">GValue</code> to get from. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>n</p></td>
<td class="parameter_description"><p>the number of elements </p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="VipsDemandStyle"></a><h3>enum VipsDemandStyle</h3>
<p>See <a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()"><code class="function">vips_image_pipelinev()</code></a>. Operations can hint to the VIPS image IO
system about the kind of demand geometry they prefer. </p>
<p>These demand styles are given below in order of increasing
restrictiveness. When demanding output from a pipeline,
<a class="link" href="libvips-generate.html#vips-image-generate" title="vips_image_generate ()"><code class="function">vips_image_generate()</code></a>
will use the most restrictive of the styles requested by the operations
in the pipeline.</p>
<p><a class="link" href="libvips-VipsImage.html#VIPS-DEMAND-STYLE-THINSTRIP:CAPS"><span class="type">VIPS_DEMAND_STYLE_THINSTRIP</span></a> --- This operation would like to output strips
the width of the image and a few pels high. This is option suitable for
point-to-point operations, such as those in the arithmetic package.</p>
<p>This option is only efficient for cases where each output pel depends
upon the pel in the corresponding position in the input image.</p>
<p><a class="link" href="libvips-VipsImage.html#VIPS-DEMAND-STYLE-FATSTRIP:CAPS"><span class="type">VIPS_DEMAND_STYLE_FATSTRIP</span></a> --- This operation would like to output strips
the width of the image and as high as possible. This option is suitable
for area operations which do not violently transform coordinates, such
as <a class="link" href="libvips-convolution.html#vips-conv" title="vips_conv ()"><code class="function">vips_conv()</code></a>. </p>
<p><a class="link" href="libvips-VipsImage.html#VIPS-DEMAND-STYLE-SMALLTILE:CAPS"><span class="type">VIPS_DEMAND_STYLE_SMALLTILE</span></a> --- This is the most general demand format.
Output is demanded in small (around 100x100 pel) sections. This style works
reasonably efficiently, even for bizzare operations like 45 degree rotate.</p>
<p><a class="link" href="libvips-VipsImage.html#VIPS-DEMAND-STYLE-ANY:CAPS"><span class="type">VIPS_DEMAND_STYLE_ANY</span></a> --- This image is not being demand-read from a disc
file (even indirectly) so any demand style is OK. It's used for things like
<a class="link" href="libvips-create.html#vips-black" title="vips_black ()"><code class="function">vips_black()</code></a> where the pixels are calculated.</p>
<p>See also: <a class="link" href="libvips-generate.html#vips-image-pipelinev" title="vips_image_pipelinev ()"><code class="function">vips_image_pipelinev()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.9.2.11"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-DEMAND-STYLE-ERROR:CAPS"></a>VIPS_DEMAND_STYLE_ERROR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-DEMAND-STYLE-SMALLTILE:CAPS"></a>VIPS_DEMAND_STYLE_SMALLTILE</p></td>
<td class="enum_member_description">
<p>demand in small (typically 64x64 pixel) tiles</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-DEMAND-STYLE-FATSTRIP:CAPS"></a>VIPS_DEMAND_STYLE_FATSTRIP</p></td>
<td class="enum_member_description">
<p>demand in fat (typically 10 pixel high) strips</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-DEMAND-STYLE-THINSTRIP:CAPS"></a>VIPS_DEMAND_STYLE_THINSTRIP</p></td>
<td class="enum_member_description">
<p>demand in thin (typically 1 pixel high) strips</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-DEMAND-STYLE-ANY:CAPS"></a>VIPS_DEMAND_STYLE_ANY</p></td>
<td class="enum_member_description">
<p>demand geometry does not matter</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsImageType"></a><h3>enum VipsImageType</h3>
<div class="refsect3">
<a name="id-1.3.3.9.3.3"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-ERROR:CAPS"></a>VIPS_IMAGE_ERROR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-NONE:CAPS"></a>VIPS_IMAGE_NONE</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-SETBUF:CAPS"></a>VIPS_IMAGE_SETBUF</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-SETBUF-FOREIGN:CAPS"></a>VIPS_IMAGE_SETBUF_FOREIGN</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-OPENIN:CAPS"></a>VIPS_IMAGE_OPENIN</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-MMAPIN:CAPS"></a>VIPS_IMAGE_MMAPIN</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-MMAPINRW:CAPS"></a>VIPS_IMAGE_MMAPINRW</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-OPENOUT:CAPS"></a>VIPS_IMAGE_OPENOUT</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-IMAGE-PARTIAL:CAPS"></a>VIPS_IMAGE_PARTIAL</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsInterpretation"></a><h3>enum VipsInterpretation</h3>
<p>How the values in an image should be interpreted. For example, a
three-band float image of type <a class="link" href="libvips-VipsImage.html#VIPS-INTERPRETATION-LAB:CAPS"><span class="type">VIPS_INTERPRETATION_LAB</span></a> should have its
pixels interpreted as coordinates in CIE Lab space.</p>
<p>These values are set by operations as hints to user-interfaces built on top
of VIPS to help them show images to the user in a meaningful way.
Operations do not use these values to decide their action.</p>
<p>The gaps in numbering are historical and must be maintained. Allocate
new numbers from the end.</p>
<div class="refsect3">
<a name="id-1.3.3.9.4.6"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-ERROR:CAPS"></a>VIPS_INTERPRETATION_ERROR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-MULTIBAND:CAPS"></a>VIPS_INTERPRETATION_MULTIBAND</p></td>
<td class="enum_member_description">
<p>generic many-band image</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-B-W:CAPS"></a>VIPS_INTERPRETATION_B_W</p></td>
<td class="enum_member_description">
<p>some kind of single-band image</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-HISTOGRAM:CAPS"></a>VIPS_INTERPRETATION_HISTOGRAM</p></td>
<td class="enum_member_description">
<p>a 1D image, eg. histogram or lookup table</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-XYZ:CAPS"></a>VIPS_INTERPRETATION_XYZ</p></td>
<td class="enum_member_description">
<p>the first three bands are CIE XYZ </p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-LAB:CAPS"></a>VIPS_INTERPRETATION_LAB</p></td>
<td class="enum_member_description">
<p>pixels are in CIE Lab space</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-CMYK:CAPS"></a>VIPS_INTERPRETATION_CMYK</p></td>
<td class="enum_member_description">
<p>the first four bands are in CMYK space</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-LABQ:CAPS"></a>VIPS_INTERPRETATION_LABQ</p></td>
<td class="enum_member_description">
<p>implies <a class="link" href="libvips-VipsImage.html#VIPS-CODING-LABQ:CAPS"><span class="type">VIPS_CODING_LABQ</span></a></p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-RGB:CAPS"></a>VIPS_INTERPRETATION_RGB</p></td>
<td class="enum_member_description">
<p>generic RGB space</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-CMC:CAPS"></a>VIPS_INTERPRETATION_CMC</p></td>
<td class="enum_member_description">
<p>a uniform colourspace based on CMC(1:1)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-LCH:CAPS"></a>VIPS_INTERPRETATION_LCH</p></td>
<td class="enum_member_description">
<p>pixels are in CIE LCh space</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-LABS:CAPS"></a>VIPS_INTERPRETATION_LABS</p></td>
<td class="enum_member_description">
<p>CIE LAB coded as three signed 16-bit values</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-sRGB"></a>VIPS_INTERPRETATION_sRGB</p></td>
<td class="enum_member_description">
<p>pixels are sRGB</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-YXY:CAPS"></a>VIPS_INTERPRETATION_YXY</p></td>
<td class="enum_member_description">
<p>pixels are CIE Yxy</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-FOURIER:CAPS"></a>VIPS_INTERPRETATION_FOURIER</p></td>
<td class="enum_member_description">
<p>image is in fourier space</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-RGB16:CAPS"></a>VIPS_INTERPRETATION_RGB16</p></td>
<td class="enum_member_description">
<p>generic 16-bit RGB</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-GREY16:CAPS"></a>VIPS_INTERPRETATION_GREY16</p></td>
<td class="enum_member_description">
<p>generic 16-bit mono</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-MATRIX:CAPS"></a>VIPS_INTERPRETATION_MATRIX</p></td>
<td class="enum_member_description">
<p>a matrix</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-scRGB"></a>VIPS_INTERPRETATION_scRGB</p></td>
<td class="enum_member_description">
<p>pixels are scRGB</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-HSV:CAPS"></a>VIPS_INTERPRETATION_HSV</p></td>
<td class="enum_member_description">
<p>pixels are HSV</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-INTERPRETATION-LAST:CAPS"></a>VIPS_INTERPRETATION_LAST</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsBandFormat"></a><h3>enum VipsBandFormat</h3>
<p>The format used for each band element. </p>
<p>Each corresponds to a native C type for the current machine. For example,
<a class="link" href="libvips-VipsImage.html#VIPS-FORMAT-USHORT:CAPS"><span class="type">VIPS_FORMAT_USHORT</span></a> is <span class="type">unsigned short</span>.</p>
<div class="refsect3">
<a name="id-1.3.3.9.5.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-NOTSET:CAPS"></a>VIPS_FORMAT_NOTSET</p></td>
<td class="enum_member_description">
<p>invalid setting</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-UCHAR:CAPS"></a>VIPS_FORMAT_UCHAR</p></td>
<td class="enum_member_description">
<p>unsigned char format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-CHAR:CAPS"></a>VIPS_FORMAT_CHAR</p></td>
<td class="enum_member_description">
<p>char format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-USHORT:CAPS"></a>VIPS_FORMAT_USHORT</p></td>
<td class="enum_member_description">
<p>unsigned short format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-SHORT:CAPS"></a>VIPS_FORMAT_SHORT</p></td>
<td class="enum_member_description">
<p>short format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-UINT:CAPS"></a>VIPS_FORMAT_UINT</p></td>
<td class="enum_member_description">
<p>unsigned int format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-INT:CAPS"></a>VIPS_FORMAT_INT</p></td>
<td class="enum_member_description">
<p>int format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-FLOAT:CAPS"></a>VIPS_FORMAT_FLOAT</p></td>
<td class="enum_member_description">
<p>float format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-COMPLEX:CAPS"></a>VIPS_FORMAT_COMPLEX</p></td>
<td class="enum_member_description">
<p>complex (two floats) format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-DOUBLE:CAPS"></a>VIPS_FORMAT_DOUBLE</p></td>
<td class="enum_member_description">
<p>double float format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-DPCOMPLEX:CAPS"></a>VIPS_FORMAT_DPCOMPLEX</p></td>
<td class="enum_member_description">
<p>double complex (two double) format</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-FORMAT-LAST:CAPS"></a>VIPS_FORMAT_LAST</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsCoding"></a><h3>enum VipsCoding</h3>
<p>How pixels are coded. </p>
<p>Normally, pixels are uncoded and can be manipulated as you would expect.
However some file formats code pixels for compression, and sometimes it's
useful to be able to manipulate images in the coded format.</p>
<p>The gaps in the numbering are historical and must be maintained. Allocate
new numbers from the end.</p>
<div class="refsect3">
<a name="id-1.3.3.9.6.6"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-CODING-ERROR:CAPS"></a>VIPS_CODING_ERROR</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-CODING-NONE:CAPS"></a>VIPS_CODING_NONE</p></td>
<td class="enum_member_description">
<p>pixels are not coded</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-CODING-LABQ:CAPS"></a>VIPS_CODING_LABQ</p></td>
<td class="enum_member_description">
<p>pixels encode 3 float CIELAB values as 4 uchar</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-CODING-RAD:CAPS"></a>VIPS_CODING_RAD</p></td>
<td class="enum_member_description">
<p>pixels encode 3 float RGB as 4 uchar (Radiance coding)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-CODING-LAST:CAPS"></a>VIPS_CODING_LAST</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsAccess"></a><h3>enum VipsAccess</h3>
<p>The type of access an operation has to supply. See <a class="link" href="libvips-conversion.html#vips-tilecache" title="vips_tilecache ()"><code class="function">vips_tilecache()</code></a>
and <span class="type">VipsForeign</span>. </p>
<p><em class="parameter"><code>VIPS_ACCESS_RANDOM</code></em>
means requests can come in any order. </p>
<p><em class="parameter"><code>VIPS_ACCESS_SEQUENTIAL</code></em>
means requests will be top-to-bottom, but with some
amount of buffering behind the read point for small non-local accesses. </p>
<p><em class="parameter"><code>VIPS_ACCESS_SEQUENTIAL_UNBUFFERED</code></em>
means requests will be strictly
top-to-bottom with no read-behind. This can save some memory.</p>
<div class="refsect3">
<a name="id-1.3.3.9.7.7"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ACCESS-RANDOM:CAPS"></a>VIPS_ACCESS_RANDOM</p></td>
<td class="enum_member_description">
<p>can read anywhere</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ACCESS-SEQUENTIAL:CAPS"></a>VIPS_ACCESS_SEQUENTIAL</p></td>
<td class="enum_member_description">
<p>top-to-bottom reading only, but with a small buffer</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ACCESS-SEQUENTIAL-UNBUFFERED:CAPS"></a>VIPS_ACCESS_SEQUENTIAL_UNBUFFERED</p></td>
<td class="enum_member_description">
<p>top-to-bottom reading only</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="VIPS-ACCESS-LAST:CAPS"></a>VIPS_ACCESS_LAST</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="VipsProgress"></a><h3>VipsProgress</h3>
<pre class="programlisting">typedef struct {
int run; /* Time we have been running */
int eta; /* Estimated seconds of computation left */
gint64 tpels; /* Number of pels we expect to calculate */
gint64 npels; /* Number of pels calculated so far */
int percent; /* Percent complete */
GTimer *start; /* Start time */
} VipsProgress;
</pre>
<p>A structure available to eval callbacks giving information on evaluation
progress. See <span class="type">“eval”</span>.</p>
<div class="refsect3">
<a name="id-1.3.3.9.8.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.run"></a>run</code></em>;</p></td>
<td class="struct_member_description"><p>Time we have been running </p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.eta"></a>eta</code></em>;</p></td>
<td class="struct_member_description"><p>Estimated seconds of computation left </p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">gint64</span> <em class="structfield"><code><a name="VipsProgress.tpels"></a>tpels</code></em>;</p></td>
<td class="struct_member_description"><p>Number of pels we expect to calculate</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">gint64</span> <em class="structfield"><code><a name="VipsProgress.npels"></a>npels</code></em>;</p></td>
<td class="struct_member_description"><p>Number of pels calculated so far</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">int</span> <em class="structfield"><code><a name="VipsProgress.percent"></a>percent</code></em>;</p></td>
<td class="struct_member_description"><p>Percent complete</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">GTimer</span> *<em class="structfield"><code><a name="VipsProgress.start"></a>start</code></em>;</p></td>
<td class="struct_member_description"><p>Start time </p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="libvips-VipsImage.see-also"></a><h2>See Also</h2>
<a class="link" href="libvips-header.html" title="header">header</a>VipsRegion<a class="link" href="libvips-generate.html" title="generate">generate</a>VipsOperation
</div>
</div>
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