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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/image.xml, last change in rev 1.36 -->
<refentry id="function.imagecolortransparent">
<refnamediv>
<refname>imagecolortransparent</refname>
<refpurpose>Define a color as transparent</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>int</type><methodname>imagecolortransparent</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>color</parameter></methodparam>
</methodsynopsis>
<para>
<function>imagecolortransparent</function> sets the transparent
color in the <parameter>image</parameter> image to
<parameter>color</parameter>. <parameter>image</parameter> is the
image identifier returned by <function>imagecreate</function> and
<parameter>color</parameter> is a color identifier returned by
<function>imagecolorallocate</function>.
</para>
<note>
<para>
The transparent color is a property of the image, transparency is not a
property of the color. Once you have set a color to be the transparent
color, any regions of the image in that color that were drawn previously
will be transparent.
</para>
</note>
<para>
The identifier of the new (or current, if none is specified)
transparent color is returned.
</para>
<note>
<para>
Transparency is copied only with <function>imagecopymerge</function> and
true color images, not with <function>imagecopy</function> or pallete images.
</para>
</note>
</refsect1>
</refentry>
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