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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<refentry xml:id="function.imagecopyresized" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>imagecopyresized</refname>
<refpurpose>Copy and resize part of an image</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>imagecopyresized</methodname>
<methodparam><type>resource</type><parameter>dst_image</parameter></methodparam>
<methodparam><type>resource</type><parameter>src_image</parameter></methodparam>
<methodparam><type>int</type><parameter>dst_x</parameter></methodparam>
<methodparam><type>int</type><parameter>dst_y</parameter></methodparam>
<methodparam><type>int</type><parameter>src_x</parameter></methodparam>
<methodparam><type>int</type><parameter>src_y</parameter></methodparam>
<methodparam><type>int</type><parameter>dst_w</parameter></methodparam>
<methodparam><type>int</type><parameter>dst_h</parameter></methodparam>
<methodparam><type>int</type><parameter>src_w</parameter></methodparam>
<methodparam><type>int</type><parameter>src_h</parameter></methodparam>
</methodsynopsis>
<para>
<function>imagecopyresized</function> copies a rectangular
portion of one image to another image.
<parameter>dst_image</parameter> is the destination image,
<parameter>src_image</parameter> is the source image identifier.
</para>
<para>
In other words, <function>imagecopyresized</function> will take an
rectangular area from <parameter>src_image</parameter> of width
<parameter>src_w</parameter> and height <parameter>src_h</parameter> at
position (<parameter>src_x</parameter>,<parameter>src_y</parameter>)
and place it in a rectangular area of <parameter>dst_image</parameter>
of width <parameter>dst_w</parameter> and height <parameter>dst_h</parameter>
at position (<parameter>dst_x</parameter>,<parameter>dst_y</parameter>).
</para>
<para>
If the source and destination coordinates and width and heights
differ, appropriate stretching or shrinking of the image fragment
will be performed. The coordinates refer to the upper left
corner. This function can be used to copy regions within the
same image (if <parameter>dst_image</parameter> is the same as
<parameter>src_image</parameter>) but if the regions overlap the
results will be unpredictable.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>dst_im</parameter></term>
<listitem>
<para>
Destination image link resource.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>src_im</parameter></term>
<listitem>
<para>
Source image link resource.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>dst_x</parameter></term>
<listitem>
<para>
x-coordinate of destination point.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>dst_y</parameter></term>
<listitem>
<para>
y-coordinate of destination point.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>src_x</parameter></term>
<listitem>
<para>
x-coordinate of source point.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>src_y</parameter></term>
<listitem>
<para>
y-coordinate of source point.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>dst_w</parameter></term>
<listitem>
<para>
Destination width.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>dst_h</parameter></term>
<listitem>
<para>
Destination height.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>src_w</parameter></term>
<listitem>
<para>
Source width.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>src_h</parameter></term>
<listitem>
<para>
Source height.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Resizing an image</title>
<para>
This example will display the image at half size.
</para>
<programlisting role="php">
<![CDATA[
<?php
// File and new size
$filename = 'test.jpg';
$percent = 0.5;
// Content type
header('Content-type: image/jpeg');
// Get new sizes
list($width, $height) = getimagesize($filename);
$newwidth = $width * $percent;
$newheight = $height * $percent;
// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);
// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
// Output
imagejpeg($thumb);
?>
]]>
</programlisting>
&example.outputs.similar;
<mediaobject>
<imageobject>
<imagedata fileref="figures/image.imagecopyresized.jpg"/>
</imageobject>
</mediaobject>
<para>
The image will be output at half size, though better
quality could be obtained using <function>imagecopyresampled</function>.
</para>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
There is a problem due to palette image limitations (255+1 colors).
Resampling or filtering an image commonly needs more colors than 255, a
kind of approximation is used to calculate the new resampled pixel and its
color. With a palette image we try to allocate a new color, if that
failed, we choose the closest (in theory) computed color. This is
not always the closest visual color. That may produce a weird result, like
blank (or visually blank) images. To skip this problem, please use a
truecolor image as a destination image, such as one created by
<function>imagecreatetruecolor</function>.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<function>imagecopyresampled</function>
</para>
</refsect1>
</refentry>
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