mirror of
https://github.com/sigmasternchen/php-doc-en
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f85d380904
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@350828 c90b9560-bf6c-de11-be94-00142212c4b1
110 lines
2.6 KiB
XML
110 lines
2.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.imagesavealpha" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagesavealpha</refname>
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<refpurpose>Whether to retain full alpha channel information when saving PNG images</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>imagesavealpha</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam><type>bool</type><parameter>saveflag</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imagesavealpha</function> sets the flag which determines whether to retain
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full alpha channel information (as opposed to single-color transparency)
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when saving PNG images.
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</para>
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<para>
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Alphablending has to be disabled (<code>imagealphablending($im, false)</code>)
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to retain the alpha-channel in the first place.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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&gd.image.description;
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<varlistentry>
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<term><parameter>saveflag</parameter></term>
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<listitem>
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<para>
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Whether to save the alpha channel or not. Defaults to &false;.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Basic <function>imagesavealpha</function> Usage</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Load a png image with alpha channel
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$png = imagecreatefrompng('./alphachannel_example.png');
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// Turn off alpha blending
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imagealphablending($png, false);
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// Do desired operations
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// Set alpha flag
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imagesavealpha($png, true);
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// Output image to browser
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header('Content-Type: image/png');
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imagepng($png);
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imagedestroy($png);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>imagealphablending</function></member>
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</simplelist>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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