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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#libvips-mask.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#libvips-mask.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="libvips-mask"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libvips-mask.top_of_page"></a>mask</span></h2>
<p>mask — load, save and process mask (matrix) objects</p>
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<div class="refsect1">
<a name="libvips-mask.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="libvips-mask.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;vips/vips.h&gt;

                    <a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK">INTMASK</a>;
                    <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK">DOUBLEMASK</a>;
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-create-imask" title="im_create_imask ()">im_create_imask</a>                     (<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>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-create-imaskv" title="im_create_imaskv ()">im_create_imaskv</a>                    (<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>...</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-create-dmask" title="im_create_dmask ()">im_create_dmask</a>                     (<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>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-create-dmaskv" title="im_create_dmaskv ()">im_create_dmaskv</a>                    (<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>...</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-read-imask" title="im_read_imask ()">im_read_imask</a>                       (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()">im_read_dmask</a>                       (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-mask.html#im-print-imask" title="im_print_imask ()">im_print_imask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-mask.html#im-print-dmask" title="im_print_dmask ()">im_print_dmask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-write-imask" title="im_write_imask ()">im_write_imask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-write-dmask" title="im_write_dmask ()">im_write_dmask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-write-imask-name" title="im_write_imask_name ()">im_write_imask_name</a>                 (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-write-dmask-name" title="im_write_dmask_name ()">im_write_dmask_name</a>                 (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-free-imask" title="im_free_imask ()">im_free_imask</a>                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-free-dmask" title="im_free_dmask ()">im_free_dmask</a>                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-log-imask" title="im_log_imask ()">im_log_imask</a>                        (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-log-dmask" title="im_log_dmask ()">im_log_dmask</a>                        (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-gauss-imask" title="im_gauss_imask ()">im_gauss_imask</a>                      (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-gauss-imask-sep" title="im_gauss_imask_sep ()">im_gauss_imask_sep</a>                  (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()">im_gauss_dmask</a>                      (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-gauss-dmask-sep" title="im_gauss_dmask_sep ()">im_gauss_dmask_sep</a>                  (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-dup-imask" title="im_dup_imask ()">im_dup_imask</a>                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-dup-dmask" title="im_dup_dmask ()">im_dup_dmask</a>                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-scale-dmask" title="im_scale_dmask ()">im_scale_dmask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libvips-mask.html#im-norm-dmask" title="im_norm_dmask ()">im_norm_dmask</a>                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mask</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-imask2dmask" title="im_imask2dmask ()">im_imask2dmask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-dmask2imask" title="im_dmask2imask ()">im_dmask2imask</a>                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-rotate-imask90" title="im_rotate_imask90 ()">im_rotate_imask90</a>                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-rotate-imask45" title="im_rotate_imask45 ()">im_rotate_imask45</a>                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-rotate-dmask90" title="im_rotate_dmask90 ()">im_rotate_dmask90</a>                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-rotate-dmask45" title="im_rotate_dmask45 ()">im_rotate_dmask45</a>                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()">im_mattrn</a>                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-matcat" title="im_matcat ()">im_matcat</a>                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *top</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *bottom</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-matmul" title="im_matmul ()">im_matmul</a>                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in1</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in2</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-lu-decomp" title="im_lu_decomp ()">im_lu_decomp</a>                        (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-lu-solve" title="im_lu_solve ()">im_lu_solve</a>                         (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *lu</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *vec</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()">im_matinv</a>                           (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-mask.html#im-matinv-inplace" title="im_matinv_inplace ()">im_matinv_inplace</a>                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>);
<a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        <a class="link" href="libvips-mask.html#im-local-dmask" title="im_local_dmask ()">im_local_dmask</a>                      (<em class="parameter"><code><span class="type">struct _VipsImage</span> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mask</code></em>);
<a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           <a class="link" href="libvips-mask.html#im-local-imask" title="im_local_imask ()">im_local_imask</a>                      (<em class="parameter"><code><span class="type">struct _VipsImage</span> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *mask</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-mask.description"></a><h2>Description</h2>
<p>
These operations load, save and process mask objects. Masks are used as
paramaters to convolution and morphology operators, and to represent
matrices. There are two types of matrix: integer <a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> and double 
precision floating point <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a>.
</p>
<p>
This API is horrible and clunky. Surely it will be replaced soon.
</p>
</div>
<div class="refsect1">
<a name="libvips-mask.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="INTMASK:CAPS"></a><h3>INTMASK</h3>
<pre class="programlisting">typedef struct {
	int xsize;
	int ysize;
	int scale;
	int offset;
	int *coeff;
	char *filename;
} INTMASK;
</pre>
<p>
An integer mask. 
</p>
<p>
<em class="parameter"><code>scale</code></em> lets the mask represent fractional values: for
example, in integer convolution (see <a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>) the result of the
convolution is divided by <em class="parameter"><code>scale</code></em> and then added to <em class="parameter"><code>offset</code></em> before being 
written to the output image.
</p>
<p>
<em class="parameter"><code>scale</code></em> and <em class="parameter"><code>offset</code></em> default to 1 and 0. Various functions, such as
<a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>, will fail if <em class="parameter"><code>scale</code></em> is zero.
</p>
<p>
You can read and write the matrix elements in <em class="parameter"><code>coeff</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="INTMASK--CAPS.xsize"></a>xsize</code></em>;</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="INTMASK--CAPS.ysize"></a>ysize</code></em>;</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="INTMASK--CAPS.scale"></a>scale</code></em>;</span></p></td>
<td>mask scale factor</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="INTMASK--CAPS.offset"></a>offset</code></em>;</span></p></td>
<td>mask offset</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> *<em class="structfield"><code><a name="INTMASK--CAPS.coeff"></a>coeff</code></em>;</span></p></td>
<td>array of mask elements</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">char</span> *<em class="structfield"><code><a name="INTMASK--CAPS.filename"></a>filename</code></em>;</span></p></td>
<td>the file this mask was read from, or should be written to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="DOUBLEMASK:CAPS"></a><h3>DOUBLEMASK</h3>
<pre class="programlisting">typedef struct {
	int xsize;
	int ysize;
	double scale;
	double offset;
	double *coeff;
	char *filename;
} DOUBLEMASK;
</pre>
<p>
A floating-point mask. 
</p>
<p>
As with <a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a>, in convolution (see <code class="function">im_convf()</code>) the result of the
convolution is divided by <em class="parameter"><code>scale</code></em> and then added to <em class="parameter"><code>offset</code></em> before being 
written to the output image.
</p>
<p>
<em class="parameter"><code>scale</code></em> and <em class="parameter"><code>offset</code></em> default to 1.0 and 0.0. Various functions, such as
<a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>, will fail if <em class="parameter"><code>scale</code></em> is zero.
</p>
<p>
You can read and write the matrix elements in <em class="parameter"><code>coeff</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="DOUBLEMASK--CAPS.xsize"></a>xsize</code></em>;</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="DOUBLEMASK--CAPS.ysize"></a>ysize</code></em>;</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="DOUBLEMASK--CAPS.scale"></a>scale</code></em>;</span></p></td>
<td>mask scale factor</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> <em class="structfield"><code><a name="DOUBLEMASK--CAPS.offset"></a>offset</code></em>;</span></p></td>
<td>mask offset</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">double</span> *<em class="structfield"><code><a name="DOUBLEMASK--CAPS.coeff"></a>coeff</code></em>;</span></p></td>
<td>array of mask elements</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">char</span> *<em class="structfield"><code><a name="DOUBLEMASK--CAPS.filename"></a>filename</code></em>;</span></p></td>
<td>the file this mask was read from, or should be written to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-create-imask"></a><h3>im_create_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_create_imask                     (<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>);</pre>
<p>
Create an empty imask. You need to loop over <em class="parameter"><code>coeff</code></em> to set the values. 
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-create-imaskv" title="im_create_imaskv ()"><code class="function">im_create_imaskv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>set mask filename to this</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly-allocated mask.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-create-imaskv"></a><h3>im_create_imaskv ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_create_imaskv                    (<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>...</code></em>);</pre>
<p>
Create an imask and initialise it from the function parameter list.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-create-imask" title="im_create_imask ()"><code class="function">im_create_imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>set mask filename to this</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>values to set for the mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly-allocated mask.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-create-dmask"></a><h3>im_create_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_create_dmask                     (<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>);</pre>
<p>
Create an empty dmask. You need to loop over <em class="parameter"><code>coeff</code></em> to set the values. 
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-create-dmaskv" title="im_create_dmaskv ()"><code class="function">im_create_dmaskv()</code></a>, <a class="link" href="libvips-conversion.html#im-vips2mask" title="im_vips2mask ()"><code class="function">im_vips2mask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>set mask filename to this</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly-allocated mask.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-create-dmaskv"></a><h3>im_create_dmaskv ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_create_dmaskv                    (<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>...</code></em>);</pre>
<p>
Create a dmask and initialise it from the function parameter list.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-create-dmask" title="im_create_dmask ()"><code class="function">im_create_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>set mask filename to this</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>mask width</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>mask height</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>...</code></em> :</span></p></td>
<td>values to set for the mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The newly-allocated mask.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-read-imask"></a><h3>im_read_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_read_imask                       (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Reads an integer matrix from a file.
</p>
<p>
This function works exactly as <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()"><code class="function">im_read_dmask()</code></a>, but the loaded matrix is
checked for 'int-ness'. All coefficients must be integers, and scale and
offset must be integers.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()"><code class="function">im_read_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>read matrix from this file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the loaded mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-read-dmask"></a><h3>im_read_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_read_dmask                       (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Reads a matrix from a file.
</p>
<p>
Matrix files have a simple format that's supposed to be easy to create with
a text editor or a spreadsheet. 
</p>
<p>
The first line has four numbers for width, height, scale and
offset (scale and offset may be omitted, in which case they default to 1.0
and 0.0). Scale must be non-zero. Width and height must be positive
integers. The numbers are separated by any mixture of spaces, commas, 
tabs and quotation marks ("). The scale and offset fields may be 
floating-point, and must use '.'
as a decimal separator.
</p>
<p>
Subsequent lines each hold one line of matrix data, with numbers again
separated by any mixture of spaces, commas, 
tabs and quotation marks ("). The numbers may be floating-point, and must
use '.'
as a decimal separator.
</p>
<p>
Extra characters at the ends of lines or at the end of the file are
ignored.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-read-imask" title="im_read_imask ()"><code class="function">im_read_imask()</code></a>, <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>read matrix from this file</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the loaded mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-print-imask"></a><h3>im_print_imask ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im_print_imask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);</pre>
<p>
Print an imask to stdout.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-print-dmask" title="im_print_dmask ()"><code class="function">im_print_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to print</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-print-dmask"></a><h3>im_print_dmask ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im_print_dmask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);</pre>
<p>
Print a dmask to stdout.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-print-imask" title="im_print_imask ()"><code class="function">im_print_imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to print</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-write-imask"></a><h3>im_write_imask ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_write_imask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);</pre>
<p>
Write an imask to a file.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-write-imask-name" title="im_write_imask_name ()"><code class="function">im_write_imask_name()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to write</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-write-dmask"></a><h3>im_write_dmask ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_write_dmask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);</pre>
<p>
Write a dmask to a file. See <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()"><code class="function">im_read_dmask()</code></a> for a description of the mask
file format.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-write-dmask-name" title="im_write_dmask_name ()"><code class="function">im_write_dmask_name()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to write</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-write-imask-name"></a><h3>im_write_imask_name ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_write_imask_name                 (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Write an imask to a file. See <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()"><code class="function">im_read_dmask()</code></a> for a description of the mask
file format.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-write-imask" title="im_write_imask ()"><code class="function">im_write_imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to write</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename to write to</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-write-dmask-name"></a><h3>im_write_dmask_name ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_write_dmask_name                 (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Write a dmask to a file. See <a class="link" href="libvips-mask.html#im-read-dmask" title="im_read_dmask ()"><code class="function">im_read_dmask()</code></a> for a description of the mask
file format.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-write-dmask" title="im_write_dmask ()"><code class="function">im_write_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to write</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename to write to</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-free-imask"></a><h3>im_free_imask ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_free_imask                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>);</pre>
<p>
Free mask structure and any attached arrays. Return zero, so we can use
these functions as close callbacks.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-free-dmask" title="im_free_dmask ()"><code class="function">im_free_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to free</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>zero.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-free-dmask"></a><h3>im_free_dmask ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_free_dmask                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>);</pre>
<p>
Free mask structure and any attached arrays. Return zero, so we can use
these functions as close callbacks.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-free-dmask" title="im_free_dmask ()"><code class="function">im_free_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to free</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>zero.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-log-imask"></a><h3>im_log_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_log_imask                        (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-log-imask" title="im_log_imask ()"><code class="function">im_log_imask()</code></a> works exactly as <a class="link" href="libvips-mask.html#im-log-dmask" title="im_log_dmask ()"><code class="function">im_log_dmask()</code></a>, but the returned mask
is scaled so that it's maximum value it set to 100.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-log-dmask" title="im_log_dmask ()"><code class="function">im_log_dmask()</code></a>, <a class="link" href="libvips-mask.html#im-gauss-imask" title="im_gauss_imask ()"><code class="function">im_gauss_imask()</code></a>, <a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-log-dmask"></a><h3>im_log_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_log_dmask                        (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-log-dmask" title="im_log_dmask ()"><code class="function">im_log_dmask()</code></a> creates a circularly symmetric Laplacian of Gaussian mask 
of radius 
<em class="parameter"><code>sigma</code></em>.  The size of the mask is determined by the variable <em class="parameter"><code>min_ampl</code></em>; 
if for instance the value .1 is entered this means that the produced mask 
is clipped at values within 10 persent of zero, and where the change 
between mask elements is less than 10%.
</p>
<p>
The program uses the following equation: (from Handbook of Pattern 
Recognition and image processing by Young and Fu, AP 1986 pages 220-221):
</p>
<p>
 H(r) = (1 / (2 * M_PI * s4)) *
	(2 - (r2 / s2)) * 
	exp(-r2 / (2 * s2))
</p>
<p>
where s2 = sigma * sigma, s4 = s2 * s2, r2 = r * r.  
</p>
<p>
The generated mask has odd size and its maximum value is normalised to 1.0.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-log-imask" title="im_log_imask ()"><code class="function">im_log_imask()</code></a>, <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, <a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-gauss-imask"></a><h3>im_gauss_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_gauss_imask                      (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-gauss-imask" title="im_gauss_imask ()"><code class="function">im_gauss_imask()</code></a> works exactly as <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, but the returned mask
is scaled so that it's maximum value it set to 100.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, <a class="link" href="libvips-mask.html#im-gauss-imask-sep" title="im_gauss_imask_sep ()"><code class="function">im_gauss_imask_sep()</code></a>, <a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>, <a class="link" href="libvips-convolution.html#im-convsep" title="im_convsep ()"><code class="function">im_convsep()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-gauss-imask-sep"></a><h3>im_gauss_imask_sep ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_gauss_imask_sep                  (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-gauss-imask-sep" title="im_gauss_imask_sep ()"><code class="function">im_gauss_imask_sep()</code></a> works exactly as <a class="link" href="libvips-mask.html#im-gauss-imask" title="im_gauss_imask ()"><code class="function">im_gauss_imask()</code></a>, but returns only
the central line of the mask. This is useful with <a class="link" href="libvips-convolution.html#im-convsep" title="im_convsep ()"><code class="function">im_convsep()</code></a>.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, <a class="link" href="libvips-convolution.html#im-convsep" title="im_convsep ()"><code class="function">im_convsep()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-gauss-dmask"></a><h3>im_gauss_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_gauss_dmask                      (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a> creates a circularly symmetric Gaussian mask of radius 
<em class="parameter"><code>sigma</code></em>.  The size of the mask is determined by the variable <em class="parameter"><code>min_ampl</code></em>; 
if for instance the value .1 is entered this means that the produced mask 
is clipped at values less than 10 percent of the maximum amplitude.
</p>
<p>
The program uses the following equation:
</p>
<p>
  H(r) = exp( -(r * r) / (2 * sigma * sigma) )
</p>
<p>
The generated mask has odd size and its maximum value is normalised to
1.0.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-gauss-imask" title="im_gauss_imask ()"><code class="function">im_gauss_imask()</code></a>, <a class="link" href="libvips-mask.html#im-gauss-imask-sep" title="im_gauss_imask_sep ()"><code class="function">im_gauss_imask_sep()</code></a>, <a class="link" href="libvips-mask.html#im-log-dmask" title="im_log_dmask ()"><code class="function">im_log_dmask()</code></a>, <a class="link" href="libvips-convolution.html#im-conv" title="im_conv ()"><code class="function">im_conv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-gauss-dmask-sep"></a><h3>im_gauss_dmask_sep ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_gauss_dmask_sep                  (<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> sigma</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> min_ampl</code></em>);</pre>
<p>
<a class="link" href="libvips-mask.html#im-gauss-dmask-sep" title="im_gauss_dmask_sep ()"><code class="function">im_gauss_dmask_sep()</code></a> works exactly as <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, but returns only
the central line of the mask. This is useful with <code class="function">im_convsepf()</code>.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-gauss-dmask" title="im_gauss_dmask ()"><code class="function">im_gauss_dmask()</code></a>, <code class="function">im_convsepf()</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the returned mask has this set as the filename</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sigma</code></em> :</span></p></td>
<td>standard deviation of mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_ampl</code></em> :</span></p></td>
<td>minimum amplitude</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the calculated mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-dup-imask"></a><h3>im_dup_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_dup_imask                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Duplicate an imask.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-dup-dmask" title="im_dup_dmask ()"><code class="function">im_dup_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to duplicate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename to set for the new mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the mask copy, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-dup-dmask"></a><h3>im_dup_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_dup_dmask                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Duplicate a dmask.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-dup-imask" title="im_dup_imask ()"><code class="function">im_dup_imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to duplicate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename to set for the new mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the mask copy, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-scale-dmask"></a><h3>im_scale_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_scale_dmask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Scale the dmask to make an imask with a maximum value of 20.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-norm-dmask" title="im_norm_dmask ()"><code class="function">im_norm_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to scale</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename for returned mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the converted mask, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-norm-dmask"></a><h3>im_norm_dmask ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                im_norm_dmask                       (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mask</code></em>);</pre>
<p>
Normalise the dmask. Apply the scale and offset to each element to make
a mask with scale 1, offset zero.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-scale-dmask" title="im_scale_dmask ()"><code class="function">im_scale_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask</code></em> :</span></p></td>
<td>mask to scale</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-imask2dmask"></a><h3>im_imask2dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_imask2dmask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Make a dmask from the imask.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-dmask2imask" title="im_dmask2imask ()"><code class="function">im_dmask2imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename for returned mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the converted mask, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-dmask2imask"></a><h3>im_dmask2imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_dmask2imask                      (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Make an imask from the dmask, rounding to nearest. 
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-scale-dmask" title="im_scale_dmask ()"><code class="function">im_scale_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>mask to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename for returned mask</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the converted mask, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-rotate-imask90"></a><h3>im_rotate_imask90 ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_rotate_imask90                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Returns a mask which is the argument mask rotated by 90 degrees.  
Pass the filename to set for the output.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-rotate-imask45" title="im_rotate_imask45 ()"><code class="function">im_rotate_imask45()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-rotate-imask45"></a><h3>im_rotate_imask45 ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_rotate_imask45                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Returns a mask which is the argument mask rotated by 45 degrees.  
Pass the filename to set for the output.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-rotate-imask90" title="im_rotate_imask90 ()"><code class="function">im_rotate_imask90()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-rotate-dmask90"></a><h3>im_rotate_dmask90 ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_rotate_dmask90                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Returns a mask which is the argument mask rotated by 90 degrees.  
Pass the filename to set for the output.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-rotate-dmask45" title="im_rotate_dmask45 ()"><code class="function">im_rotate_dmask45()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-rotate-dmask45"></a><h3>im_rotate_dmask45 ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_rotate_dmask45                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Returns a mask which is the argument mask rotated by 45 degrees.  
Pass the filename to set for the output.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-rotate-dmask90" title="im_rotate_dmask90 ()"><code class="function">im_rotate_dmask90()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-mattrn"></a><h3>im_mattrn ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_mattrn                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Transposes the input matrix.
Pass the filename to set for the output.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-matmul" title="im_matmul ()"><code class="function">im_matmul()</code></a>, <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()"><code class="function">im_matinv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-matcat"></a><h3>im_matcat ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_matcat                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *top</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *bottom</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Matrix catenations. Returns a new matrix which is the two source matrices
joined together top-bottom. They must be the same width.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>, <a class="link" href="libvips-mask.html#im-matmul" title="im_matmul ()"><code class="function">im_matmul()</code></a>, <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()"><code class="function">im_matinv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>top</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bottom</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>filename for output</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the joined mask on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-matmul"></a><h3>im_matmul ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_matmul                           (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in1</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *in2</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Multiplies two DOUBLEMASKs. Result matrix is made and returned.
Pass the filename to set for the output.
</p>
<p>
The scale and offset members of <em class="parameter"><code>in1</code></em> and <em class="parameter"><code>in2</code></em> are ignored.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>, <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()"><code class="function">im_matinv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td>
<td>input matrix</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lu-decomp"></a><h3>im_lu_decomp ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_lu_decomp                        (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
This function takes any square NxN <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a>.
It returns a <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> which is (N+1)xN.
</p>
<p>
It calculates the PLU decomposition, storing the upper and diagonal parts
of U, together with the lower parts of L, as an NxN matrix in the first
N rows of the new matrix.  The diagonal parts of L are all set to unity 
and are not stored.  
</p>
<p>
The final row of the new <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> has only integer entries, which 
represent the row-wise permutations made by the permuatation matrix P.
</p>
<p>
The scale and offset members of the input <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> are ignored.
</p>
<p>
See:
</p>
<p>
  PRESS, W. et al, 1992.  Numerical Recipies in C; The Art of Scientific 
  Computing, 2nd ed.  Cambridge: Cambridge University Press, pp. 43-50.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>, <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()"><code class="function">im_matinv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mat</code></em> :</span></p></td>
<td>matrix to decompose</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the decomposed matrix on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lu-solve"></a><h3>im_lu_solve ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lu_solve                         (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *lu</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> *vec</code></em>);</pre>
<p>
Solve the system of linear equations Ax=b, where matrix A has already
been decomposed into LU form in DOUBLEMASK *lu.  Input vector b is in
vec and is overwritten with vector x.
</p>
<p>
See:
</p>
<p>
  PRESS, W. et al, 1992.  Numerical Recipies in C; The Art of Scientific 
  Computing, 2nd ed.  Cambridge: Cambridge University Press, pp. 43-50.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>, <a class="link" href="libvips-mask.html#im-matinv" title="im_matinv ()"><code class="function">im_matinv()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>lu</code></em> :</span></p></td>
<td>matrix to solve</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>vec</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the decomposed matrix on success, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-matinv"></a><h3>im_matinv ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_matinv                           (<em class="parameter"><code>const <a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>);</pre>
<p>
Allocate, and return a pointer to, a DOUBLEMASK representing the 
inverse of the matrix represented in <em class="parameter"><code>mat</code></em>.  Give it the filename
member <em class="parameter"><code>filename</code></em>.  Returns NULL on error.  Scale and offset are ignored.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mat</code></em> :</span></p></td>
<td>matrix to invert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>name for output matrix</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the inverted matrix on success, or <code class="literal">NULL</code> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-matinv-inplace"></a><h3>im_matinv_inplace ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_matinv_inplace                   (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mat</code></em>);</pre>
<p>
Invert the matrix represented by the DOUBLEMASK <em class="parameter"><code>mat</code></em>, and store 
it in the place of <em class="parameter"><code>mat</code></em>. Scale and offset
are ignored.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-mattrn" title="im_mattrn ()"><code class="function">im_mattrn()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mat</code></em> :</span></p></td>
<td>matrix to invert</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, or -1 on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-local-dmask"></a><h3>im_local_dmask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="returnvalue">DOUBLEMASK</span></a> *        im_local_dmask                      (<em class="parameter"><code><span class="type">struct _VipsImage</span> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *mask</code></em>);</pre>
<p>
<em class="parameter"><code>out</code></em> takes ownership of <em class="parameter"><code>mask</code></em>: when <em class="parameter"><code>out</code></em> is closed, <em class="parameter"><code>mask</code></em> will be closed
for you. If <a class="link" href="libvips-mask.html#im-local-dmask" title="im_local_dmask ()"><code class="function">im_local_dmask()</code></a> itself fails, the mask is also freed.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-local-imask" title="im_local_imask ()"><code class="function">im_local_imask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>image to make the mask local to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask</code></em> :</span></p></td>
<td>mask to local-ize</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the mask, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-local-imask"></a><h3>im_local_imask ()</h3>
<pre class="programlisting"><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="returnvalue">INTMASK</span></a> *           im_local_imask                      (<em class="parameter"><code><span class="type">struct _VipsImage</span> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libvips-mask.html#INTMASK:CAPS" title="INTMASK"><span class="type">INTMASK</span></a> *mask</code></em>);</pre>
<p>
<em class="parameter"><code>out</code></em> takes ownership of <em class="parameter"><code>mask</code></em>: when <em class="parameter"><code>out</code></em> is closed, <em class="parameter"><code>mask</code></em> will be closed
for you. If <a class="link" href="libvips-mask.html#im-local-imask" title="im_local_imask ()"><code class="function">im_local_imask()</code></a> itself fails, the mask is also freed.
</p>
<p>
See also: <a class="link" href="libvips-mask.html#im-local-dmask" title="im_local_dmask ()"><code class="function">im_local_dmask()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>image to make the mask local to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mask</code></em> :</span></p></td>
<td>mask to local-ize</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the mask, or NULL on error.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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