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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 309972 $ -->
<refentry xml:id="function.imagecolorclosest" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagecolorclosest</refname>
<refpurpose>Get the index of the closest color to the specified color</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>imagecolorclosest</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam><type>int</type><parameter>red</parameter></methodparam>
<methodparam><type>int</type><parameter>green</parameter></methodparam>
<methodparam><type>int</type><parameter>blue</parameter></methodparam>
</methodsynopsis>
<para>
Returns the index of the color in the palette of the image which
is "closest" to the specified <acronym>RGB</acronym> value.
</para>
<para>
The "distance" between the desired color and each color in the
palette is calculated as if the <acronym>RGB</acronym> values
represented points in three-dimensional space.
</para>
<para>&gd.image.colors;</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>red</parameter></term>
<listitem>
<para>&gd.value.red;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>green</parameter></term>
<listitem>
<para>&gd.value.green;</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>blue</parameter></term>
<listitem>
<para>&gd.value.blue;</para>
</listitem>
</varlistentry>
</variablelist>
The colors parameters are integers between 0 and 255 or hexadecimals
between 0x00 and 0xFF.
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the index of the closest color, in the palette of the image, to
the specified one
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Search for a set of colors in an image</title>
<programlisting role="php">
<![CDATA[
<?php
// Start with an image and convert it to a palette-based image
$im = imagecreatefrompng('figures/imagecolorclosest.png');
imagetruecolortopalette($im, false, 255);
// Search colors (RGB)
$colors = array(
array(254, 145, 154),
array(153, 145, 188),
array(153, 90, 145),
array(255, 137, 92)
);
// Loop through each search and find the closest color in the palette.
// Return the search number, the search RGB and the converted RGB match
foreach($colors as $id => $rgb)
{
$result = imagecolorclosest($im, $rgb[0], $rgb[1], $rgb[2]);
$result = imagecolorsforindex($im, $result);
$result = "({$result['red']}, {$result['green']}, {$result['blue']})";
echo "#$id: Search ($rgb[0], $rgb[1], $rgb[2]); Closest match: $result.\n";
}
imagedestroy($im);
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
#0: Search (254, 145, 154); Closest match: (252, 150, 148).
#1: Search (153, 145, 188); Closest match: (148, 150, 196).
#2: Search (153, 90, 145); Closest match: (148, 90, 156).
#3: Search (255, 137, 92); Closest match: (252, 150, 92).
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagecolorexact</function></member>
<member><function>imagecolorclosestalpha</function></member>
<member><function>imagecolorclosesthwb</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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