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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.15 $ -->
<refentry xml:id="function.imagesavealpha" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagesavealpha</refname>
<refpurpose>Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imagesavealpha</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam><type>bool</type><parameter>saveflag</parameter></methodparam>
</methodsynopsis>
<para>
<function>imagesavealpha</function> sets the flag to attempt to save
full alpha channel information (as opposed to single-color transparency)
when saving PNG images.
</para>
<para>
You have to unset alphablending
(<literal>imagealphablending($im, false)</literal>), to use it.
</para>
<para>
Alpha channel is not supported by all browsers, if you have problem with
your browser, try to load your script with an alpha channel compliant
browser, e.g. latest Mozilla.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>saveflag</parameter></term>
<listitem>
<para>
Whether to save the alpha channel or not. Default to &false;.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>imagesavealpha</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Load a png image with alpha channels
$png = imagecreatefrompng('./alphachannel_example.png');
// Do required operations
// Turn off alpha blending and set alpha flag
imagealphablending($png, false);
imagesavealpha($png, true);
// Output image to browser
header('Content-Type: image/png');
imagepng($png);
imagedestroy($png);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
¬e.gd.2;
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagealphablending</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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sgml-default-dtd-file:"../../../../manual.ced"
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vi: ts=1 sw=1
-->
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