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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 1.2 $ -->
<chapter xml:id="image.setup" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.setup;
<!-- {{{ Requirements -->
<section xml:id="image.requirements">
&reftitle.required;
<para>
If you have the <acronym>GD</acronym> library (available at <link
xlink:href="&url.gd;">&url.gd;</link>) you will also be able to create
and manipulate images.
</para>
<para>
The format of images you are able to manipulate depend on the
version of <acronym>GD</acronym> you install, and any other libraries
<acronym>GD</acronym> might need to access those image formats.
Versions of <acronym>GD</acronym> older than gd-1.6
support GIF format images, and do not support PNG, where versions
greater than gd-1.6 and less than gd-2.0.28 support PNG, not GIF. GIF
support was re-enabled in gd-2.0.28.
<note>
<simpara>
Since PHP 4.3 there is a bundled version of the GD lib. This bundled
version has some additional features like alpha blending, and should
be used in preference to the external library
since its codebase is better maintained and more stable.
</simpara>
</note>
</para>
<note>
<para>
Support for GD 1.x has been removed as of PHP 6.0.0, which requires GD
2.0.33 or later.
</para>
</note>
<para>
You may wish to enhance GD to handle more image formats.
<table>
<title>Supported image formats</title>
<tgroup cols="3">
<thead>
<row>
<entry>Image format</entry>
<entry>Library to download</entry>
<entry>Notes</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>gif</literal></entry>
<entry></entry>
<entry>
Only supported in GD versions older than gd-1.6 and newer than
gd-2.0.28. <emphasis>Read-only
</emphasis> GIF support is available with PHP 4.3.0 and the bundled
GD-library. <emphasis>Write</emphasis> support is available since
PHP 4.3.9 and PHP 5.0.1.
</entry>
</row>
<row>
<entry><literal>jpeg-6b</literal></entry>
<entry><link xlink:href="&url.jpeg;">&url.jpeg;</link></entry>
<entry>
When buliding the jpeg-v6b library (prior to building PHP) you
must use the <option role="configure">--enable-shared</option>
option in the configure step. If you do not, you will receive
an error saying <literal>libjpeg.(a|so) not found</literal>
when you get to the configure step of building PHP.
</entry>
</row>
<row>
<entry><literal>png</literal></entry>
<entry><link xlink:href="&url.libpng;">&url.libpng;</link></entry>
<entry>
Only supported in GD versions greater than gd-1.6.
</entry>
</row>
<row>
<entry><literal>xpm</literal></entry>
<entry><link xlink:href="&url.libxpm;">&url.libxpm;</link></entry>
<entry>
It's likely you have this library already available, if your system
has an installed X-Environment.
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<para>
You may wish to enhance GD to deal with different fonts. The following
font libraries are supported:
<table>
<title>Supported font libraries</title>
<tgroup cols="3">
<thead>
<row>
<entry>Font library</entry>
<entry>Download</entry>
<entry>Notes</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>FreeType 1.x</literal></entry>
<entry><link xlink:href="&url.freetype;">&url.freetype;</link></entry>
<entry>Support removed as of PHP 6.0.0</entry>
</row>
<row>
<entry><literal>FreeType 2</literal></entry>
<entry><link xlink:href="&url.freetype;">&url.freetype;</link></entry>
<entry></entry>
</row>
<row>
<entry><literal>T1lib</literal></entry>
<entry><link xlink:href="&url.t1lib;">&url.t1lib;</link>)</entry>
<entry>
Support for Postscript Type 1 fonts.
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</section>
<!-- }}} -->
<!-- {{{ Installation -->
&reference.image.configure;
<!-- }}} -->
<!-- {{{ Configuration -->
&reference.image.ini;
<!-- }}} -->
<!-- {{{ Resources -->
<section xml:id="image.resources">
&reftitle.resources;
<para>
This extension defines two resource types: an image identifier and a font
identifier.
</para>
</section>
<!-- }}} -->
</chapter>
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