/
imagesetinterpolation.xml
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/
imagesetinterpolation.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.imagesetinterpolation" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagesetinterpolation</refname>
<refpurpose>Set the interpolation method</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imagesetinterpolation</methodname>
<methodparam><type>resource</type><parameter>image</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>method</parameter><initializer>IMG_BILINEAR_FIXED</initializer></methodparam>
</methodsynopsis>
<para>
Sets the interpolation method, setting an interpolation method affects the rendering
of various functions in GD, such as the <function>imagerotate</function> function.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&gd.image.description;
<varlistentry>
<term><parameter>method</parameter></term>
<listitem>
<para>
The interpolation method, which can be one of the following:
<itemizedlist>
<listitem>
<simpara>
<constant>IMG_BELL</constant>: Bell filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BESSEL</constant>: Bessel filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BICUBIC</constant>: Bicubic interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BICUBIC_FIXED</constant>: Fixed point implementation of the bicubic interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BILINEAR_FIXED</constant>: Fixed point implementation of the bilinear interpolation (<literal>default (also on image creation)</literal>).
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BLACKMAN</constant>: Blackman window function.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BOX</constant>: Box blur filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_BSPLINE</constant>: Spline interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_CATMULLROM</constant>: Cubic Hermite spline interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_GAUSSIAN</constant>: Gaussian function.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_GENERALIZED_CUBIC</constant>: Generalized cubic spline fractal interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_HERMITE</constant>: Hermite interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_HAMMING</constant>: Hamming filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_HANNING</constant>: Hanning filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_MITCHELL</constant>: Mitchell filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_POWER</constant>: Power interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_QUADRATIC</constant>: Inverse quadratic interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_SINC</constant>: Sinc function.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_NEAREST_NEIGHBOUR</constant>: Nearest neighbour interpolation.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_WEIGHTED4</constant>: Weighting filter.
</simpara>
</listitem>
<listitem>
<simpara>
<constant>IMG_TRIANGLE</constant>: Triangle interpolation.
</simpara>
</listitem>
</itemizedlist>
</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>imagesetinterpolation</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Load an image
$im = imagecreate(500, 500);
// By default interpolation is IMG_BILINEAR_FIXED, switch
// to use the 'Mitchell' filter:
imagesetinterpolation($im, IMG_MITCHELL);
// Continue to work with $im ...
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<para>
Changing the interpolation method affects the following functions
when rendering:
<itemizedlist>
<listitem>
<simpara>
<function>imageaffine</function>
</simpara>
</listitem>
<listitem>
<simpara>
<function>imagerotate</function>
</simpara>
</listitem>
<listitem>
<simpara>
<function>imagescale</function>
</simpara>
</listitem>
</itemizedlist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->