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<a href="#libvips-other.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="libvips-other"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libvips-other.top_of_page"></a>other</span></h2>
<p>other — miscellaneous operators</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libvips-other.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv">
<a name="libvips-other.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <vips/vips.h>
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-benchmark2" title="im_benchmark2 ()">im_benchmark2</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> *out</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-benchmarkn" title="im_benchmarkn ()">im_benchmarkn</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> n</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-eye" title="im_eye ()">im_eye</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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>,
<em class="parameter"><code>const <span class="type">double</span> factor</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-feye" title="im_feye ()">im_feye</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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>,
<em class="parameter"><code>const <span class="type">double</span> factor</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-fgrey" title="im_fgrey ()">im_fgrey</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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-fzone" title="im_fzone ()">im_fzone</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> size</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-grey" title="im_grey ()">im_grey</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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()">im_make_xy</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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-sines" title="im_sines ()">im_sines</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> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">double</span> horfreq</code></em>,
<em class="parameter"><code><span class="type">double</span> verfreq</code></em>);
<span class="returnvalue">int</span> <a class="link" href="libvips-other.html#im-zone" title="im_zone ()">im_zone</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> size</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libvips-other.description"></a><h2>Description</h2>
<p>
These functions generate various test images. You can combine them with
the arithmetic and rotate functions to build more complicated images.
</p>
<p>
The <code class="function">im_benchmark()</code> operations are for testing the VIPS SMP system.
</p>
</div>
<div class="refsect1">
<a name="libvips-other.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="im-benchmark2"></a><h3>im_benchmark2 ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_benchmark2 (<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> *out</code></em>);</pre>
<p>
This operation runs a single <a class="link" href="libvips-other.html#im-benchmarkn" title="im_benchmarkn ()"><code class="function">im_benchmarkn()</code></a> and calculates the average
pixel value. It's useful if you just want to test image input.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-benchmarkn" title="im_benchmarkn ()"><code class="function">im_benchmarkn()</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>average image 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-benchmarkn"></a><h3>im_benchmarkn ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_benchmarkn (<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> n</code></em>);</pre>
<p>
This operation runs a complicated set of other operations on image <em class="parameter"><code>in</code></em>,
producing image <em class="parameter"><code>out</code></em>. Use <em class="parameter"><code>n</code></em> to set the number of iterations to run: a
larger number will make the operation more CPU-bound, a smaller number will
make the operation more IO-bound.
</p>
<p>
See http://www.vips.ecs.soton.ac.uk/index.php?title=Benchmarks for a
detailed discussion of the benchmark and some sample results.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-benchmark2" title="im_benchmark2 ()"><code class="function">im_benchmark2()</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>n</code></em> :</span></p></td>
<td>iterations</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-eye"></a><h3>im_eye ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_eye (<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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>,
<em class="parameter"><code>const <span class="type">double</span> factor</code></em>);</pre>
<p>
Exactly as <a class="link" href="libvips-other.html#im-feye" title="im_feye ()"><code class="function">im_feye()</code></a>, but make a UCHAR image with pixels in the range [0,
255].
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-feye" title="im_feye ()"><code class="function">im_feye()</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>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>factor</code></em> :</span></p></td>
<td>image size</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-feye"></a><h3>im_feye ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_feye (<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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>,
<em class="parameter"><code>const <span class="type">double</span> factor</code></em>);</pre>
<p>
Create a test pattern with increasing spatial frequence in X and
amplitude in Y. <em class="parameter"><code>factor</code></em> should be between 0 and 1 and determines the
maximum spatial frequency.
</p>
<p>
Creates an one band float image with values in +1 to -1.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-eye" title="im_eye ()"><code class="function">im_eye()</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>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>factor</code></em> :</span></p></td>
<td>image size</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-fgrey"></a><h3>im_fgrey ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_fgrey (<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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);</pre>
<p>
Create a one-band float image with the left-most column zero and the
right-most 1. Intermediate pixels are a linear ramp.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-grey" title="im_grey ()"><code class="function">im_grey()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</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-fzone"></a><h3>im_fzone ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_fzone (<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> size</code></em>);</pre>
<p>
Create a one-band float image of size <em class="parameter"><code>size</code></em> by <em class="parameter"><code>size</code></em> pixels of a zone
plate. Pixels are in [-1, +1].
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-grey" title="im_grey ()"><code class="function">im_grey()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>image size</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-grey"></a><h3>im_grey ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_grey (<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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);</pre>
<p>
Create a one-band uchar image with the left-most column zero and the
right-most 255. Intermediate pixels are a linear ramp.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-fgrey" title="im_fgrey ()"><code class="function">im_fgrey()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</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-make-xy"></a><h3>im_make_xy ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_make_xy (<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>const <span class="type">int</span> xsize</code></em>,
<em class="parameter"><code>const <span class="type">int</span> ysize</code></em>);</pre>
<p>
Create a two-band uint32 image where the elements in the first band have the
value of their x coordinate and elements in the second band have their y
coordinate.
</p>
<p>
You can make any image where the value of a pixel is a function of its (x,
y) coordinate by combining this operator with the arithmetic operators.
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-grey" title="im_grey ()"><code class="function">im_grey()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</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-sines"></a><h3>im_sines ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_sines (<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> xsize</code></em>,
<em class="parameter"><code><span class="type">int</span> ysize</code></em>,
<em class="parameter"><code><span class="type">double</span> horfreq</code></em>,
<em class="parameter"><code><span class="type">double</span> verfreq</code></em>);</pre>
<p>
<a class="link" href="libvips-other.html#im-sines" title="im_sines ()"><code class="function">im_sines()</code></a> creates a float one band image of the a sine waveform in two
dimensions.
</p>
<p>
The number of horizontal and vertical spatial frequencies are
determined by the variables <em class="parameter"><code>horfreq</code></em> and <em class="parameter"><code>verfreq</code></em> respectively. The
function is useful for creating displayable sine waves and
square waves in two dimensions.
</p>
<p>
If horfreq and verfreq are integers the resultant image is periodical
and therfore the Fourier transform doesnot present spikes
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-grey" title="im_grey ()"><code class="function">im_grey()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>xsize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ysize</code></em> :</span></p></td>
<td>image size</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>horfreq</code></em> :</span></p></td>
<td>horizontal frequency</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>verfreq</code></em> :</span></p></td>
<td>vertical frequency</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-zone"></a><h3>im_zone ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> im_zone (<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> size</code></em>);</pre>
<p>
Create a one-band uchar image of size <em class="parameter"><code>size</code></em> by <em class="parameter"><code>size</code></em> pixels of a zone
plate. Pixels are in [0, 255].
</p>
<p>
See also: <a class="link" href="libvips-other.html#im-grey" title="im_grey ()"><code class="function">im_grey()</code></a>, <a class="link" href="libvips-other.html#im-make-xy" title="im_make_xy ()"><code class="function">im_make_xy()</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>out</code></em> :</span></p></td>
<td>output image</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>image size</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>
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