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| <a href="#libvips-relational.synopsis" class="shortcut">Top</a> |
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| <a href="#libvips-relational.description" class="shortcut">Description</a> |
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| <div class="refentry" title="relational"> |
| <a name="libvips-relational"></a><div class="titlepage"></div> |
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| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="libvips-relational.top_of_page"></a>relational</span></h2> |
| <p>relational — relational comparisons between pairs of images and |
| images and constants</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsect1" title="Stability Level"> |
| <a name="libvips-relational.stability-level"></a><h2>Stability Level</h2> |
| Stable, unless otherwise indicated |
| </div> |
| <div class="refsynopsisdiv" title="Synopsis"> |
| <a name="libvips-relational.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis"> |
| #include <vips/vips.h> |
| |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-equal" title="im_equal ()">im_equal</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-notequal" title="im_notequal ()">im_notequal</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-less" title="im_less ()">im_less</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()">im_lesseq</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-more" title="im_more ()">im_more</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-moreeq" title="im_moreeq ()">im_moreeq</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-equal-vec" title="im_equal_vec ()">im_equal_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-notequal-vec" title="im_notequal_vec ()">im_notequal_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-less-vec" title="im_less_vec ()">im_less_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-lesseq-vec" title="im_lesseq_vec ()">im_lesseq_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-more-vec" title="im_more_vec ()">im_more_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-moreeq-vec" title="im_moreeq_vec ()">im_moreeq_vec</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-equalconst" title="im_equalconst ()">im_equalconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-notequalconst" title="im_notequalconst ()">im_notequalconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-lessconst" title="im_lessconst ()">im_lessconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()">im_lesseqconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-moreconst" title="im_moreconst ()">im_moreconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-moreeqconst" title="im_moreeqconst ()">im_moreeqconst</a> (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-ifthenelse" title="im_ifthenelse ()">im_ifthenelse</a> (<em class="parameter"><code><span class="type">IMAGE</span> *c</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *a</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *b</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| <span class="returnvalue">int</span> <a class="link" href="libvips-relational.html#im-blend" title="im_blend ()">im_blend</a> (<em class="parameter"><code><span class="type">IMAGE</span> *c</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *a</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *b</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>); |
| </pre> |
| </div> |
| <div class="refsect1" title="Description"> |
| <a name="libvips-relational.description"></a><h2>Description</h2> |
| <p> |
| These operations perform comparison operations, such as equals, on |
| every pixel in an image or pair of images. |
| All will work with |
| images of any type or any mixture of types of any size and of any number |
| of bands. |
| </p> |
| <p> |
| For binary operations, if the number of bands differs, one of the images |
| must have one band. In this case, an n-band image is formed from the |
| one-band image by joining n copies of the one-band image together and then |
| the two n-band images are operated upon. |
| </p> |
| <p> |
| In the same way, for operations that take an array constant, such as |
| <a class="link" href="libvips-relational.html#im-equal-vec" title="im_equal_vec ()"><code class="function">im_equal_vec()</code></a>, you can mix single-element arrays or single-band images |
| freely. |
| </p> |
| <p> |
| The output type is always unsigned char, |
| with 255 for every band element for which the condition |
| is true, and 0 for every other element. |
| For complex images, the operations calculate and compare the modulus. |
| </p> |
| <p> |
| For binary operations on pairs of images, the images must match in size. |
| </p> |
| </div> |
| <div class="refsect1" title="Details"> |
| <a name="libvips-relational.details"></a><h2>Details</h2> |
| <div class="refsect2" title="im_equal ()"> |
| <a name="im-equal"></a><h3>im_equal ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_equal (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> == <em class="parameter"><code>in2</code></em> (image element equals image element) |
| and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-notequal" title="im_notequal ()"><code class="function">im_notequal()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_notequal ()"> |
| <a name="im-notequal"></a><h3>im_notequal ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_notequal (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> != <em class="parameter"><code>in2</code></em> (image element does not equal image |
| element) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-notequal" title="im_notequal ()"><code class="function">im_notequal()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_less ()"> |
| <a name="im-less"></a><h3>im_less ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_less (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> < <em class="parameter"><code>in2</code></em> (image element is less than image |
| element) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-more" title="im_more ()"><code class="function">im_more()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_lesseq ()"> |
| <a name="im-lesseq"></a><h3>im_lesseq ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_lesseq (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> <= <em class="parameter"><code>in2</code></em> (image element is less than or equal |
| to image elemment) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-more" title="im_more ()"><code class="function">im_more()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_more ()"> |
| <a name="im-more"></a><h3>im_more ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_more (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> > <em class="parameter"><code>in2</code></em> (image element is greater than |
| image elemment) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-less" title="im_less ()"><code class="function">im_less()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_moreeq ()"> |
| <a name="im-moreeq"></a><h3>im_moreeq ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_moreeq (<em class="parameter"><code><span class="type">IMAGE</span> *in1</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *in2</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in1</code></em> >= <em class="parameter"><code>in2</code></em> (image element is greater than or |
| equal to image element) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-more" title="im_more ()"><code class="function">im_more()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in1</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 1 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>in2</code></em> :</span></p></td> |
| <td>input <span class="type">IMAGE</span> 2 |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_equal_vec ()"> |
| <a name="im-equal-vec"></a><h3>im_equal_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_equal_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> == <em class="parameter"><code>c</code></em> (image element equals constant array |
| <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-equal" title="im_equal ()"><code class="function">im_equal()</code></a>, <a class="link" href="libvips-relational.html#im-equalconst" title="im_equalconst ()"><code class="function">im_equalconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_notequal_vec ()"> |
| <a name="im-notequal-vec"></a><h3>im_notequal_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_notequal_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> != <em class="parameter"><code>c</code></em> (image element is not equal to constant |
| array <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-equal" title="im_equal ()"><code class="function">im_equal()</code></a>, <a class="link" href="libvips-relational.html#im-equal-vec" title="im_equal_vec ()"><code class="function">im_equal_vec()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_less_vec ()"> |
| <a name="im-less-vec"></a><h3>im_less_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_less_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> < <em class="parameter"><code>c</code></em> (image element is less than constant |
| array <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-less" title="im_less ()"><code class="function">im_less()</code></a>, <a class="link" href="libvips-relational.html#im-lessconst" title="im_lessconst ()"><code class="function">im_lessconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_lesseq_vec ()"> |
| <a name="im-lesseq-vec"></a><h3>im_lesseq_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_lesseq_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> <= <em class="parameter"><code>c</code></em> (image element is less than or equal to |
| constant array <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_more_vec ()"> |
| <a name="im-more-vec"></a><h3>im_more_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_more_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> > <em class="parameter"><code>c</code></em> (image element is greater than |
| constant array <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_moreeq_vec ()"> |
| <a name="im-moreeq-vec"></a><h3>im_moreeq_vec ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_moreeq_vec (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">int</span> n</code></em>, |
| <em class="parameter"><code><span class="type">double</span> *c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> >= <em class="parameter"><code>c</code></em> (image element is greater than or |
| equal to |
| constant array <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>n</code></em> :</span></p></td> |
| <td>array length |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>array of constants |
| </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" title="im_equalconst ()"> |
| <a name="im-equalconst"></a><h3>im_equalconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_equalconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> == <em class="parameter"><code>c</code></em> (image element is |
| equal to constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_notequalconst ()"> |
| <a name="im-notequalconst"></a><h3>im_notequalconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_notequalconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> != <em class="parameter"><code>c</code></em> (image element is not equal to |
| constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_lessconst ()"> |
| <a name="im-lessconst"></a><h3>im_lessconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_lessconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> < <em class="parameter"><code>c</code></em> (image element is less than |
| constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_lesseqconst ()"> |
| <a name="im-lesseqconst"></a><h3>im_lesseqconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_lesseqconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> = <em class="parameter"><code>c</code></em> (image element is less than |
| or equal to |
| constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_moreconst ()"> |
| <a name="im-moreconst"></a><h3>im_moreconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_moreconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> = <em class="parameter"><code>c</code></em> (image element is more than |
| constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_moreeqconst ()"> |
| <a name="im-moreeqconst"></a><h3>im_moreeqconst ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_moreeqconst (<em class="parameter"><code><span class="type">IMAGE</span> *in</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>, |
| <em class="parameter"><code><span class="type">double</span> c</code></em>);</pre> |
| <p> |
| This operation calculates <em class="parameter"><code>in</code></em> = <em class="parameter"><code>c</code></em> (image element is more than |
| or equal to |
| constant <em class="parameter"><code>c</code></em>) and writes the result to <em class="parameter"><code>out</code></em>. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-lesseq" title="im_lesseq ()"><code class="function">im_lesseq()</code></a>, <a class="link" href="libvips-relational.html#im-lesseqconst" title="im_lesseqconst ()"><code class="function">im_lesseqconst()</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 <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>c</code></em> :</span></p></td> |
| <td>constant |
| </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" title="im_ifthenelse ()"> |
| <a name="im-ifthenelse"></a><h3>im_ifthenelse ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_ifthenelse (<em class="parameter"><code><span class="type">IMAGE</span> *c</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *a</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *b</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation scans the condition image <em class="parameter"><code>c</code></em> (which must be unsigned char) |
| and uses it to select pixels from either the then image <em class="parameter"><code>a</code></em> or the else |
| image <em class="parameter"><code>b</code></em>. Non-zero means <em class="parameter"><code>a</code></em>, 0 means <em class="parameter"><code>b</code></em>. |
| </p> |
| <p> |
| Any image can have either 1 band or n bands, where n is the same for all |
| the non-1-band images. Single band images are then effectively copied to |
| make n-band images. |
| </p> |
| <p> |
| Images <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> are cast up to the smallest common format. |
| </p> |
| <p> |
| Images <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> must match exactly in size. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-blend" title="im_blend ()"><code class="function">im_blend()</code></a>, <a class="link" href="libvips-relational.html#im-equal" title="im_equal ()"><code class="function">im_equal()</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>c</code></em> :</span></p></td> |
| <td>condition <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td> |
| <td>then <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td> |
| <td>else <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="im_blend ()"> |
| <a name="im-blend"></a><h3>im_blend ()</h3> |
| <pre class="programlisting"><span class="returnvalue">int</span> im_blend (<em class="parameter"><code><span class="type">IMAGE</span> *c</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *a</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *b</code></em>, |
| <em class="parameter"><code><span class="type">IMAGE</span> *out</code></em>);</pre> |
| <p> |
| This operation scans the condition image <em class="parameter"><code>c</code></em> (which must be unsigned char) |
| and uses it to blend pixels from either the then image <em class="parameter"><code>a</code></em> or the else |
| image <em class="parameter"><code>b</code></em>. 255 means <em class="parameter"><code>a</code></em> only, 0 means <em class="parameter"><code>b</code></em> only, and intermediate values are a |
| mixture. |
| </p> |
| <p> |
| Any image can have either 1 band or n bands, where n is the same for all |
| the non-1-band images. Single band images are then effectively copied to |
| make n-band images. |
| </p> |
| <p> |
| Images <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> are cast up to the smallest common format. |
| </p> |
| <p> |
| Images <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> must match exactly in size. |
| </p> |
| <p> |
| See also: <a class="link" href="libvips-relational.html#im-ifthenelse" title="im_ifthenelse ()"><code class="function">im_ifthenelse()</code></a>, <a class="link" href="libvips-relational.html#im-equal" title="im_equal ()"><code class="function">im_equal()</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>c</code></em> :</span></p></td> |
| <td>condition <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>a</code></em> :</span></p></td> |
| <td>then <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>b</code></em> :</span></p></td> |
| <td>else <span class="type">IMAGE</span> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>out</code></em> :</span></p></td> |
| <td>output <span class="type">IMAGE</span> |
| </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" title="See Also"> |
| <a name="libvips-relational.see-also"></a><h2>See Also</h2> |
| <a class="link" href="libvips-arithmetic.html" title="arithmetic">arithmetic</a> |
| </div> |
| </div> |
| <div class="footer"> |
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