php-doc-en/reference/image/functions/imagecolormatch.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.imagecolormatch" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagecolormatch</refname>
  <refpurpose>Makes the colors of the palette version of an image more closely match the true color version</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>imagecolormatch</methodname>
   <methodparam><type>resource</type><parameter>image1</parameter></methodparam>
   <methodparam><type>resource</type><parameter>image2</parameter></methodparam>
  </methodsynopsis>
  <para>
   Makes the colors of the palette version of an image more closely match the true color version.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>image1</parameter></term>
     <listitem>
      <para>
       A truecolor image resource.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>image2</parameter></term>
     <listitem>
      <para>
       A palette image resource pointing to an image that has the same
       size as <parameter>image1</parameter>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>imagecolormatch</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
// Setup the true color and palette images
$im1 = imagecreatefrompng('./gdlogo.png');
$im2 = imagecreate(imagesx($im1), imagesy($im1));

// Add some colors to $im2
$colors   = Array();
$colors[] = imagecolorallocate($im2, 255, 36, 74);
$colors[] = imagecolorallocate($im2, 40, 0, 240);
$colors[] = imagecolorallocate($im2, 82, 100, 255);
$colors[] = imagecolorallocate($im2, 84, 63, 44);

// Match these colors with the true color image
imagecolormatch($im1, $im2);

// Free from memory
imagedestroy($im1);
imagedestroy($im2);
?>
]]>
   </programlisting>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>imagecreatetruecolor</function></member>
  </simplelist>
 </refsect1>
</refentry>

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