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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.15 $ -->
<refentry xml:id="function.imagepng" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagepng</refname>
<refpurpose>Output a PNG image to either the browser or a file</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imagepng</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>filename</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>quality</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>filters</parameter></methodparam>
</methodsynopsis>
<para>
Outputs or saves a <acronym>PNG</acronym> image from the given
<parameter>image</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>filename</parameter></term>
<listitem>
<para>
The path to save the file to. If not set or &null;, the raw image stream
will be outputted directly.
</para>
<note>
<para>
&null; is invalid if the <parameter>quality</parameter> and
<parameter>filters</parameter> arguments are not used.
</para>
</note>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>quality</parameter></term>
<listitem>
<para>
Compression level: from 0 (no compression) to 9.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>filters</parameter></term>
<listitem>
<para>
Allows reducing the PNG file size. It is a bitmask field which may be
set to any combination of the <literal>PNG_FILTER_XXX</literal>
constants. <constant>PNG_NO_FILTER</constant> or
<constant>PNG_ALL_FILTERS</constant> may also be used to respectively
disable or activate all filters.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.1.3</entry>
<entry>
Added the <parameter>filters</parameter> parameter.
</entry>
</row>
<row>
<entry>5.1.2</entry>
<entry>
Added the <parameter>quality</parameter> parameter.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
$im = imagecreatefrompng("test.png");
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
]]>
</programlisting>
</informalexample>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagegif</function></member>
<member><function>imagewbmp</function></member>
<member><function>imagejpeg</function></member>
<member><function>imagetypes</function></member>
<member><function>imagesavealpha</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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