mirror of
https://github.com/sigmasternchen/php-doc-en
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891e8eb600
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@99964 c90b9560-bf6c-de11-be94-00142212c4b1
67 lines
2 KiB
XML
67 lines
2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- splitted from ./en/functions/image.xml, last change in rev 1.36 -->
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<refentry id="function.imagecolorat">
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<refnamediv>
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<refname>imagecolorat</refname>
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<refpurpose>Get the index of the color of a pixel</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>imagecolorat</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam><type>int</type><parameter>x</parameter></methodparam>
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<methodparam><type>int</type><parameter>y</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the index of the color of the pixel at the
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specified location in the image specified by <parameter>image</parameter>.
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</para>
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<para>
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If PHP is compiled against GD library 2.0 or higher and the image is a
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truecolor image, this function returns the RGB value of that pixel as
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integer. Use bitshifting and masking to access the distinct red, green and blue
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component values:
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<example>
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<title>Access distinct RGB values</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$im = ImageCreateFromPng("rockym.png");
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$rgb = ImageColorAt($im, 100, 100);
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$r = ($rgb >> 16) & 0xFF;
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$g = ($rgb >> 8) & 0xFF;
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$b = $rgb & 0xFF;
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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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<para>
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See also <function>imagecolorset</function> and
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<function>imagecolorsforindex</function>.
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</para>
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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:"../../../../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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