<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.imagegammacorrect" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagegammacorrect</refname>
  <refpurpose>Apply a gamma correction to a GD image</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>imagegammacorrect</methodname>
   <methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
   <methodparam><type>float</type><parameter>input_gamma</parameter></methodparam>
   <methodparam><type>float</type><parameter>output_gamma</parameter></methodparam>
  </methodsynopsis>
  <para>
   Applies gamma correction to the given gd <parameter>image</parameter> 
   given an input and an output gamma.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.image.description;
    <varlistentry>
     <term><parameter>input_gamma</parameter></term>
     <listitem>
      <para>
       The input gamma.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>output_gamma</parameter></term>
     <listitem>
      <para>
       The output gamma.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &gd.changelog.image-param;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>imagegammacorrect</function> usage</title>
    <programlisting role="php">
<![CDATA[
<?php
// Create image instance
$im = imagecreatefromgif('php.gif');

// Correct gamma, out = 1.537
imagegammacorrect($im, 1.0, 1.537);

// Save and free image
imagegif($im, './php_gamma_corrected.gif');
imagedestroy($im);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>
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