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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.10 $ -->
<refentry xml:id="function.imagecolorexactalpha" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagecolorexactalpha</refname>
<refpurpose>Get the index of the specified color + alpha</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>imagecolorexactalpha</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>
<methodparam><type>int</type><parameter>alpha</parameter></methodparam>
</methodsynopsis>
<para>
Returns the index of the specified color+alpha in the palette of the
image.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>red</parameter></term>
<listitem>
<para>
Value of red component.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>green</parameter></term>
<listitem>
<para>
Value of green component.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>blue</parameter></term>
<listitem>
<para>
Value of blue component.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>alpha</parameter></term>
<listitem>
<para>
A value between <literal>0</literal> and <literal>127</literal>.
<literal>0</literal> indicates completely opaque while
<literal>127</literal> indicates completely transparent.
</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 specified color+alpha in the palette of the
image, or -1 if the color does not exist in the image's palette.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title>Get colors from the GD logo</title>
<programlisting role="php">
<![CDATA[
<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Array
(
[0] => 16711680
[1] => 2130706432
[2] => 939524095
[3] => 342163252
)
]]>
</screen>
</example>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.gd.2;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagecolorclosestalpha</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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