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                  <a href="#libvips-histograms-lut.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="libvips-histograms-lut.top_of_page"></a>histograms_lut</span></h2>
<p>histograms_lut — find, manipulate and apply histograms and lookup tables</p>
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<div class="refsect1">
<a name="libvips-histograms-lut.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
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<div class="refsynopsisdiv">
<a name="libvips-histograms-lut.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;vips/vips.h&gt;

<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()">im_histgr</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histnD" title="im_histnD ()">im_histnD</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bins</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-hist-indexed" title="im_hist_indexed ()">im_hist_indexed</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *index</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *value</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()">im_identity</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bands</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-identity-ushort" title="im_identity_ushort ()">im_identity_ushort</a>                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bands</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> sz</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-invertlut" title="im_invertlut ()">im_invertlut</a>                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *input</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *output</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> lut_size</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-buildlut" title="im_buildlut ()">im_buildlut</a>                         (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *input</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *output</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-project" title="im_project ()">im_project</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *hout</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vout</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histnorm" title="im_histnorm ()">im_histnorm</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histcum" title="im_histcum ()">im_histcum</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histeq" title="im_histeq ()">im_histeq</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histspec" title="im_histspec ()">im_histspec</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-ismonotonic" title="im_ismonotonic ()">im_ismonotonic</a>                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-histplot" title="im_histplot ()">im_histplot</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-maplut" title="im_maplut ()">im_maplut</a>                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-hist" title="im_hist ()">im_hist</a>                             (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-hsp" title="im_hsp ()">im_hsp</a>                              (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-gammacorrect" title="im_gammacorrect ()">im_gammacorrect</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> exponent</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-mpercent" title="im_mpercent ()">im_mpercent</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> percent</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-mpercent-hist" title="im_mpercent_hist ()">im_mpercent_hist</a>                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *hist</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> percent</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-heq" title="im_heq ()">im_heq</a>                              (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-lhisteq" title="im_lhisteq ()">im_lhisteq</a>                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xwin</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ywin</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-stdif" title="im_stdif ()">im_stdif</a>                            (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> m0</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> s0</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xwin</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ywin</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-tone-build-range" title="im_tone_build_range ()">im_tone_build_range</a>                 (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> in_max</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> out_max</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lb</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lw</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-tone-build" title="im_tone_build ()">im_tone_build</a>                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lb</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lw</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-tone-analyse" title="im_tone_analyse ()">im_tone_analyse</a>                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);
<span class="returnvalue">int</span>                 <a class="link" href="libvips-histograms-lut.html#im-tone-map" title="im_tone_map ()">im_tone_map</a>                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-histograms-lut.description"></a><h2>Description</h2>
<p>
Histograms and look-up tables are 1xn or nx1 images, where n is less than
256 or less than 65536, corresponding to 8- and 16-bit unsigned int images. 
They are
tagged with a <span class="type">VipsType</span> of IM_TYPE_HISTOGRAM and usually displayed by
user-interfaces such as nip2 as plots rather than images.
</p>
<p>
These functions can be broadly grouped as things to find or build 
histograms (<a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-buildlut" title="im_buildlut ()"><code class="function">im_buildlut()</code></a>, <code class="function">in_identity()</code>), operations that 
manipulate histograms in some way (<a class="link" href="libvips-histograms-lut.html#im-histcum" title="im_histcum ()"><code class="function">im_histcum()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histnorm" title="im_histnorm ()"><code class="function">im_histnorm()</code></a>), operations
to apply histograms (<a class="link" href="libvips-histograms-lut.html#im-maplut" title="im_maplut ()"><code class="function">im_maplut()</code></a>), and a variety of utility 
operations.
</p>
<p>
A final group of operations build tone curves. These are useful in
pre-press work for adjusting the appearance of images. They are designed
for CIELAB images, but might be useful elsewhere.
</p>
</div>
<div class="refsect1">
<a name="libvips-histograms-lut.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="im-histgr"></a><h3>im_histgr ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histgr                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);</pre>
<p>
Find the histogram of <em class="parameter"><code>in</code></em>. Find the histogram for band <em class="parameter"><code>bandno</code></em> (producing a
one-band histogram), or for all bands (producing an n-band histogram) if 
<em class="parameter"><code>bandno</code></em> is -1. 
</p>
<p>
<em class="parameter"><code>in</code></em> must be u8 or u16. <em class="parameter"><code>out</code></em> is always u32.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-hist-indexed" title="im_hist_indexed ()"><code class="function">im_hist_indexed()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histeq" title="im_histeq ()"><code class="function">im_histeq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to equalise</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histnD"></a><h3>im_histnD ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histnD                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bins</code></em>);</pre>
<p>
Make a one, two or three dimensional histogram of a 1, 2 or
3 band image. Divide each axis into a certain number of bins .. ie.
output is 1 x bins, bins x bins, or bins x bins x bins bands.
uchar and ushort only.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <code class="function">im_histindexed()</code>.
</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bins</code></em> :</span></p></td>
<td>number of bins to make on each axis</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-hist-indexed"></a><h3>im_hist_indexed ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_hist_indexed                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *index</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *value</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Make a histogram of <em class="parameter"><code>value</code></em>, but use image <em class="parameter"><code>index</code></em> to pick the bins. In other
words, element zero in <em class="parameter"><code>out</code></em> contains the sum of all the pixels in <em class="parameter"><code>value</code></em>
whose corresponding pixel in <em class="parameter"><code>index</code></em> is zero.
</p>
<p>
<em class="parameter"><code>index</code></em> must have just one band and be u8 or u16. <em class="parameter"><code>value</code></em> must be
non-complex. <em class="parameter"><code>out</code></em> always has the same size and format as <em class="parameter"><code>value</code></em>.
</p>
<p>
This operation is useful in conjunction with <a class="link" href="libvips-morphology.html#im-label-regions" title="im_label_regions ()"><code class="function">im_label_regions()</code></a>. You can
use it to find the centre of gravity of blobs in an image, for example.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-morphology.html#im-label-regions" title="im_label_regions ()"><code class="function">im_label_regions()</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>index</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>input image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-identity"></a><h3>im_identity ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_identity                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bands</code></em>);</pre>
<p>
Creates a image file with Xsize=256, Ysize=1, Bands=<em class="parameter"><code>bands</code></em>,
BandFmt=IM_BANDFMT_UCHAR, Type=IM_TYPE_HISTOGRAM.
</p>
<p>
The created image consist a <em class="parameter"><code>bands</code></em>-bands linear lut and is the basis 
for building up look-up tables.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-identity-ushort" title="im_identity_ushort ()"><code class="function">im_identity_ushort()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>lut</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bands</code></em> :</span></p></td>
<td>number of bands to create</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-identity-ushort"></a><h3>im_identity_ushort ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_identity_ushort                  (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bands</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> sz</code></em>);</pre>
<p>
As <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()"><code class="function">im_identity()</code></a>, but make a ushort LUT. ushort LUTs can be up to 65536
elements - <em class="parameter"><code>sz</code></em> is the number of elements required.
</p>
<p>
The created image consist a <em class="parameter"><code>bands</code></em>-bands linear lut and is the basis 
for building up look-up tables.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()"><code class="function">im_identity()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>lut</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bands</code></em> :</span></p></td>
<td>number of bands to create</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sz</code></em> :</span></p></td>
<td>size of LUT to create</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-invertlut"></a><h3>im_invertlut ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_invertlut                        (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *input</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *output</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> lut_size</code></em>);</pre>
<p>
Given a mask of target values and real values, generate a LUT which
will map reals to targets. Handy for linearising images from
measurements of a colour chart. All values in [0,1]. Piecewise linear
interpolation, extrapolate head and tail to 0 and 1.
</p>
<p>
Eg. input like this:
</p>
<p>
  </p>
<table border="1">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<tbody>
<tr>
<td align="left">4</td>
<td align="left">3</td>
<td class="auto-generated"> </td>
<td class="auto-generated"> </td>
</tr>
<tr>
<td align="left">0.1</td>
<td align="left">0.2</td>
<td align="left">0.3</td>
<td align="left">0.1</td>
</tr>
<tr>
<td align="left">0.2</td>
<td align="left">0.4</td>
<td align="left">0.4</td>
<td align="left">0.2</td>
</tr>
<tr>
<td align="left">0.7</td>
<td align="left">0.5</td>
<td align="left">0.6</td>
<td align="left">0.3</td>
</tr>
</tbody>
</table>
<p>
</p>
<p>
Means a patch with 10% reflectance produces an image with 20% in
channel 1, 30% in channel 2, and 10% in channel 3, and so on.
</p>
<p>
Inputs don't need to be sorted (we do that). Generate any precision
LUT, typically you might ask for 256 elements.
</p>
<p>
It won't work too well for non-monotonic camera responses 
(we should fix this). Interpolation is simple piecewise linear; we ought to 
do something better really.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-buildlut" title="im_buildlut ()"><code class="function">im_buildlut()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-invertlut" title="im_invertlut ()"><code class="function">im_invertlut()</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>input</code></em> :</span></p></td>
<td>input mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>output</code></em> :</span></p></td>
<td>output LUT</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lut_size</code></em> :</span></p></td>
<td>generate this much</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-buildlut"></a><h3>im_buildlut ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_buildlut                         (<em class="parameter"><code><a class="link" href="libvips-mask.html#DOUBLEMASK:CAPS" title="DOUBLEMASK"><span class="type">DOUBLEMASK</span></a> *input</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *output</code></em>);</pre>
<p>
This operation builds a lookup table from a set of points. Intermediate
values are generated by piecewise linear interpolation. 
</p>
<p>
For example, consider this 2 x 2 matrix of (x, y) coordinates:
</p>
<p>
  </p>
<table border="1">
<colgroup>
<col>
<col>
</colgroup>
<tbody>
<tr>
<td align="left">0</td>
<td align="left">0</td>
</tr>
<tr>
<td align="left">255</td>
<td align="left">100</td>
</tr>
</tbody>
</table>
<p>
</p>
<p>
We then generate:
</p>
<p>
  </p>
<table border="1">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th align="left">Index</th>
<th align="left">Value</th>
</tr></thead>
<tbody>
<tr>
<td align="left">0</td>
<td align="left">0</td>
</tr>
<tr>
<td align="left">1</td>
<td align="left">0.4</td>
</tr>
<tr>
<td align="left">...</td>
<td align="left">etc. by linear interpolation</td>
</tr>
<tr>
<td align="left">255</td>
<td align="left">100</td>
</tr>
</tbody>
</table>
<p>
</p>
<p>
This is then written as the output image, with the left column giving the
index in the image to place the value.
</p>
<p>
The (x, y) points don't need to be sorted: we do that. You can have 
several Ys, each becomes a band in the output LUT. You don't need to
start at zero, any integer will do, including negatives.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()"><code class="function">im_identity()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-invertlut" title="im_invertlut ()"><code class="function">im_invertlut()</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>input</code></em> :</span></p></td>
<td>input mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>output</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-project"></a><h3>im_project ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_project                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *hout</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *vout</code></em>);</pre>
<p>
Find the horizontal and vertical projections of an image, ie. the sum
of every row of pixels, and the sum of every column of pixels. The output
format is uint, int or double, depending on the input format.
</p>
<p>
Non-complex images only.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-morphology.html#im-profile" title="im_profile ()"><code class="function">im_profile()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>hout</code></em> :</span></p></td>
<td>sums of rows</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>vout</code></em> :</span></p></td>
<td>sums of columns</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histnorm"></a><h3>im_histnorm ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histnorm                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Normalise histogram ... normalise range to make it square (ie. max ==
number of elements). Normalise each band separately.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histcum" title="im_histcum ()"><code class="function">im_histcum()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histcum"></a><h3>im_histcum ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histcum                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Form cumulative histogram. 
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histnorm" title="im_histnorm ()"><code class="function">im_histnorm()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histeq"></a><h3>im_histeq ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histeq                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Histogram equalisation: normalised cumulative histogram. 
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-heq" title="im_heq ()"><code class="function">im_heq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histspec"></a><h3>im_histspec ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histspec                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Creates a lut which, when applied to the image from which histogram <em class="parameter"><code>in</code></em> was
formed, will produce an image whose PDF matches that of the image from 
which <em class="parameter"><code>ref</code></em> was formed.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-hsp" title="im_hsp ()"><code class="function">im_hsp()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-maplut" title="im_maplut ()"><code class="function">im_maplut()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference histogram</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-ismonotonic"></a><h3>im_ismonotonic ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_ismonotonic                      (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);</pre>
<p>
Test <em class="parameter"><code>lut</code></em> for monotonicity. <em class="parameter"><code>out</code></em> is set non-zero if <em class="parameter"><code>lut</code></em> is monotonic.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-tone-build-range" title="im_tone_build_range ()"><code class="function">im_tone_build_range()</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>lut</code></em> :</span></p></td>
<td>lookup-table to test</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>set non-zero if <em class="parameter"><code>lut</code></em> is monotonic</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-histplot"></a><h3>im_histplot ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_histplot                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Plot a 1 by any or any by 1 image file as a max by any or 
any by max image using these rules:
</p>
<p>
<span class="emphasis"><em>unsigned char</em></span> max is always 256 
</p>
<p>
<span class="emphasis"><em>other unsigned integer types</em></span> output 0 - maxium 
value of <em class="parameter"><code>in</code></em>.
</p>
<p>
<span class="emphasis"><em>signed int types</em></span> min moved to 0, max moved to max + min.
</p>
<p>
<span class="emphasis"><em>float types</em></span> min moved to 0, max moved to any 
(square output)
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-hist-indexed" title="im_hist_indexed ()"><code class="function">im_hist_indexed()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histeq" title="im_histeq ()"><code class="function">im_histeq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-maplut"></a><h3>im_maplut ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_maplut                           (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>);</pre>
<p>
Map an image through another image acting as a LUT (Look Up Table). 
The lut may have any type, and the output image will be that type.
</p>
<p>
The input image will be cast to one of the unsigned integer types, that is,
IM_BANDFMT_UCHAR, IM_BANDFMT_USHORT or IM_BANDFMT_UINT.
</p>
<p>
If <em class="parameter"><code>lut</code></em> is too small for the input type (for example, if <em class="parameter"><code>in</code></em> is
IM_BANDFMT_UCHAR but <em class="parameter"><code>lut</code></em> only has 100 elements), the lut is padded out
by copying the last element. Overflows are reported at the end of 
computation.
If <em class="parameter"><code>lut</code></em> is too large, extra values are ignored. 
</p>
<p>
If <em class="parameter"><code>lut</code></em> has one band, then all bands of <em class="parameter"><code>in</code></em> pass through it. If <em class="parameter"><code>lut</code></em>
has same number of bands as <em class="parameter"><code>in</code></em>, then each band is mapped
separately. If <em class="parameter"><code>in</code></em> has one band, then <em class="parameter"><code>lut</code></em> may have many bands and
the output will have the same number of bands as <em class="parameter"><code>lut</code></em>.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()"><code class="function">im_identity()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lut</code></em> :</span></p></td>
<td>look-up table</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-hist"></a><h3>im_hist ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_hist                             (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);</pre>
<p>
Find and plot the histogram of <em class="parameter"><code>in</code></em>. If <em class="parameter"><code>bandno</code></em> is -1, plot all bands. 
Otherwise plot the specified band.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histplot" title="im_histplot ()"><code class="function">im_histplot()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to plot</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-hsp"></a><h3>im_hsp ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_hsp                              (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *ref</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>);</pre>
<p>
Maps image <em class="parameter"><code>in</code></em> to image <em class="parameter"><code>out</code></em>, adjusting the histogram to match image <em class="parameter"><code>ref</code></em>.
Both images should have the same number of bands.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histspec" title="im_histspec ()"><code class="function">im_histspec()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ref</code></em> :</span></p></td>
<td>reference histogram</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-gammacorrect"></a><h3>im_gammacorrect ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_gammacorrect                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> exponent</code></em>);</pre>
<p>
Gamma-correct an 8- or 16-bit unsigned image with a lookup table. The
output format is the same as the input format.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-identity" title="im_identity ()"><code class="function">im_identity()</code></a>, <a class="link" href="libvips-arithmetic.html#im-powtra" title="im_powtra ()"><code class="function">im_powtra()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-maplut" title="im_maplut ()"><code class="function">im_maplut()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>exponent</code></em> :</span></p></td>
<td>gamma factor</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-mpercent"></a><h3>im_mpercent ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_mpercent                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> percent</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);</pre>
<p>
<a class="link" href="libvips-histograms-lut.html#im-mpercent" title="im_mpercent ()"><code class="function">im_mpercent()</code></a> returns (through the <em class="parameter"><code>out</code></em> parameter) the threshold above 
which there are <em class="parameter"><code>percent</code></em> values of <em class="parameter"><code>in</code></em>. If for example percent=.1, the
number of pels of the input image with values greater than the returned 
int will correspond to 10% of all pels of the image.
</p>
<p>
The function works for uchar and ushort images only.  It can be used 
to threshold the scaled result of a filtering operation.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-morphology.html#im-profile" title="im_profile ()"><code class="function">im_profile()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td>threshold percentage</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output threshold value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-mpercent-hist"></a><h3>im_mpercent_hist ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_mpercent_hist                    (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *hist</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> percent</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> *out</code></em>);</pre>
<p>
Just like <a class="link" href="libvips-histograms-lut.html#im-mpercent" title="im_mpercent ()"><code class="function">im_mpercent()</code></a>, except it works on an image histogram. Handy if
you want to run <a class="link" href="libvips-histograms-lut.html#im-mpercent" title="im_mpercent ()"><code class="function">im_mpercent()</code></a> several times without having to recompute the
histogram each time.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-mpercent" title="im_mpercent ()"><code class="function">im_mpercent()</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>hist</code></em> :</span></p></td>
<td>input histogram image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td>threshold percentage</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output threshold value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-heq"></a><h3>im_heq ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_heq                              (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> bandno</code></em>);</pre>
<p>
Histogram-equalise <em class="parameter"><code>in</code></em>. Equalise using band <em class="parameter"><code>bandno</code></em>, or if <em class="parameter"><code>bandno</code></em> is -1,
equalise all bands.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-lhisteq" title="im_lhisteq ()"><code class="function">im_lhisteq()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histgr" title="im_histgr ()"><code class="function">im_histgr()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-histeq" title="im_histeq ()"><code class="function">im_histeq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bandno</code></em> :</span></p></td>
<td>band to equalise</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-lhisteq"></a><h3>im_lhisteq ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_lhisteq                          (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xwin</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ywin</code></em>);</pre>
<p>
Performs local histogram equalisation on <em class="parameter"><code>in</code></em> using a
window of size <em class="parameter"><code>xwin</code></em> by <em class="parameter"><code>ywin</code></em> centered on the input pixel. Works only on 
monochrome images.
</p>
<p>
The output image is the same size as the input image. The edge pixels are
created by copy edge pixels of the input image outwards.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-stdif" title="im_stdif ()"><code class="function">im_stdif()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-heq" title="im_heq ()"><code class="function">im_heq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xwin</code></em> :</span></p></td>
<td>width of region</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ywin</code></em> :</span></p></td>
<td>height of region</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-stdif"></a><h3>im_stdif ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_stdif                            (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> a</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> m0</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> b</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> s0</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> xwin</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> ywin</code></em>);</pre>
<p>
<a class="link" href="libvips-histograms-lut.html#im-stdif" title="im_stdif ()"><code class="function">im_stdif()</code></a> preforms statistical differencing according to the formula
given in page 45 of the book "An Introduction to Digital Image 
Processing" by Wayne Niblack. This transformation emphasises the way in 
which a pel differs statistically from its neighbours. It is useful for 
enhancing low-contrast images with lots of detail, such as X-ray plates.
</p>
<p>
At point (i,j) the output is given by the equation:
</p>
<p>
vout(i,j) = <em class="parameter"><code>a</code></em> * <em class="parameter"><code>m0</code></em> + (1 - <em class="parameter"><code>a</code></em>) * meanv + 
      (vin(i,j) - meanv) * (<em class="parameter"><code>b</code></em> * <em class="parameter"><code>s0</code></em>) / (<em class="parameter"><code>s0</code></em> + <em class="parameter"><code>b</code></em> * stdv)
</p>
<p>
Values <em class="parameter"><code>a</code></em>, <em class="parameter"><code>m0</code></em>, <em class="parameter"><code>b</code></em> and <em class="parameter"><code>s0</code></em> are entered, while meanv and stdv are the values
calculated over a moving window of size <em class="parameter"><code>xwin</code></em>, <em class="parameter"><code>ywin</code></em> centred on pixel (i,j). 
<em class="parameter"><code>m0</code></em> is the new mean, <em class="parameter"><code>a</code></em> is the weight given to it. <em class="parameter"><code>s0</code></em> is the new standard 
deviation, <em class="parameter"><code>b</code></em> is the weight given to it. 
</p>
<p>
Try:
</p>
<p>
vips im_stdif $VIPSHOME/pics/huysum.v fred.v 0.5 128 0.5 50 11 11
</p>
<p>
The operation works on one-band uchar images only, and writes a one-band 
uchar image as its result. The output image has the same size as the 
input.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-lhisteq" title="im_lhisteq ()"><code class="function">im_lhisteq()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td>
<td>weight of new mean</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>m0</code></em> :</span></p></td>
<td>target mean</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td>
<td>weight of new deviation</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>s0</code></em> :</span></p></td>
<td>target deviation</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xwin</code></em> :</span></p></td>
<td>width of region</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ywin</code></em> :</span></p></td>
<td>height of region</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tone-build-range"></a><h3>im_tone_build_range ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tone_build_range                 (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> in_max</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> out_max</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lb</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lw</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);</pre>
<p>
<a class="link" href="libvips-histograms-lut.html#im-tone-build-range" title="im_tone_build_range ()"><code class="function">im_tone_build_range()</code></a> generates a tone curve for the adjustment of image 
levels. It is mostly designed for adjusting the L* part of a LAB image in
way suitable for print work, but you can use it for other things too.
</p>
<p>
The curve is an unsigned 16-bit image with (<em class="parameter"><code>in_max</code></em> + 1) entries, 
each in the range [0, <em class="parameter"><code>out_max</code></em>].
</p>
<p>
<em class="parameter"><code>Lb</code></em>, <em class="parameter"><code>Lw</code></em> are expressed as 0-100, as in LAB colour space. You 
specify the scaling for the input and output images with the <em class="parameter"><code>in_max</code></em> and 
<em class="parameter"><code>out_max</code></em> parameters.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-ismonotonic" title="im_ismonotonic ()"><code class="function">im_ismonotonic()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-tone-map" title="im_tone_map ()"><code class="function">im_tone_map()</code></a>, <a class="link" href="libvips-histograms-lut.html#im-tone-analyse" title="im_tone_analyse ()"><code class="function">im_tone_analyse()</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>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>in_max</code></em> :</span></p></td>
<td>input range</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_max</code></em> :</span></p></td>
<td>output range</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Lb</code></em> :</span></p></td>
<td>black-point [0-100]</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Lw</code></em> :</span></p></td>
<td>white-point [0-100]</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ps</code></em> :</span></p></td>
<td>shadow point (eg. 0.2)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Pm</code></em> :</span></p></td>
<td>mid-tone point (eg. 0.5)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ph</code></em> :</span></p></td>
<td>highlight point (eg. 0.8)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>S</code></em> :</span></p></td>
<td>shadow adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>M</code></em> :</span></p></td>
<td>mid-tone adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>H</code></em> :</span></p></td>
<td>highlight adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tone-build"></a><h3>im_tone_build ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tone_build                       (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lb</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Lw</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);</pre>
<p>
As <a class="link" href="libvips-histograms-lut.html#im-tone-build-range" title="im_tone_build_range ()"><code class="function">im_tone_build_range()</code></a>, but set 32767 and 32767 as values for <em class="parameter"><code>in_max</code></em> 
and <em class="parameter"><code>out_max</code></em>. This makes a curve suitable for correcting LABS
images, the most common case.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-tone-build-range" title="im_tone_build_range ()"><code class="function">im_tone_build_range()</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>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Lb</code></em> :</span></p></td>
<td>black-point [0-100]</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Lw</code></em> :</span></p></td>
<td>white-point [0-100]</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ps</code></em> :</span></p></td>
<td>shadow point (eg. 0.2)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Pm</code></em> :</span></p></td>
<td>mid-tone point (eg. 0.5)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ph</code></em> :</span></p></td>
<td>highlight point (eg. 0.8)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>S</code></em> :</span></p></td>
<td>shadow adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>M</code></em> :</span></p></td>
<td>mid-tone adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>H</code></em> :</span></p></td>
<td>highlight adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tone-analyse"></a><h3>im_tone_analyse ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tone_analyse                     (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ps</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Pm</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> Ph</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> S</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> M</code></em>,
                                                         <em class="parameter"><code><span class="type">double</span> H</code></em>);</pre>
<p>
As <a class="link" href="libvips-histograms-lut.html#im-tone-build" title="im_tone_build ()"><code class="function">im_tone_build()</code></a>, but analyse the histogram of <em class="parameter"><code>in</code></em> and use it to
pick the 0.1% and 99.9% points for <em class="parameter"><code>Lb</code></em> and <em class="parameter"><code>Lw</code></em>.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-tone-build" title="im_tone_build ()"><code class="function">im_tone_build()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ps</code></em> :</span></p></td>
<td>shadow point (eg. 0.2)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Pm</code></em> :</span></p></td>
<td>mid-tone point (eg. 0.5)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>Ph</code></em> :</span></p></td>
<td>highlight point (eg. 0.8)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>S</code></em> :</span></p></td>
<td>shadow adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>M</code></em> :</span></p></td>
<td>mid-tone adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>H</code></em> :</span></p></td>
<td>highlight adjustment (+/- 30)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="im-tone-map"></a><h3>im_tone_map ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span>                 im_tone_map                         (<em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *in</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *out</code></em>,
                                                         <em class="parameter"><code><a class="link" href="VipsImage.html" title="VipsImage"><span class="type">VipsImage</span></a> *lut</code></em>);</pre>
<p>
Map the first channel of <em class="parameter"><code>in</code></em> through <em class="parameter"><code>lut</code></em>. If <em class="parameter"><code>in</code></em> is IM_CODING_LABQ, unpack
to LABS, map L and then repack. 
</p>
<p>
<em class="parameter"><code>in</code></em> should be a LABS or LABQ image for this to work
sensibly.
</p>
<p>
See also: <a class="link" href="libvips-histograms-lut.html#im-maplut" title="im_maplut ()"><code class="function">im_maplut()</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 image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lut</code></em> :</span></p></td>
<td>look-up table</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>0 on success, -1 on error</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="libvips-histograms-lut.see-also"></a><h2>See Also</h2>
image
</div>
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