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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 288721 $ -->
<!-- Purpose: utilspec.image -->
<!-- Membership: bundled -->
<book xml:id="book.image" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Image Processing and GD</title>
<titleabbrev>GD</titleabbrev>
<!-- {{{ preface -->
<preface xml:id="intro.image">
&reftitle.intro;
<para>
PHP is not limited to creating just HTML output. It can also be
used to create and manipulate image files in a variety of different
image formats, including <acronym>GIF</acronym>, <acronym>PNG</acronym>,
<acronym>JPEG</acronym>, <acronym>WBMP</acronym>, and <acronym>XPM</acronym>.
Even more convenient, PHP can output image streams directly to a browser. You
will need to compile PHP with the <acronym>GD</acronym> library of image
functions for this to work. <acronym>GD</acronym> and PHP may also require
other libraries, depending on which image formats you want to work with.
</para>
<para>
You can use the image functions in PHP to get the size of
<acronym>JPEG</acronym>, <acronym>GIF</acronym>,
<acronym>PNG</acronym>, <acronym>SWF</acronym>,
<acronym>TIFF</acronym> and <acronym>JPEG2000</acronym> images.
</para>
<para>
With the <link linkend="ref.exif">exif extension</link>, you are able
to work with information stored in headers of
<acronym>JPEG</acronym> and <acronym>TIFF</acronym> images. This way you can
read meta data generated by digital cameras. The exif
functions do not require the <acronym>GD</acronym> library.
</para>
<para>
<note>
<simpara>
Read the requirements section about how to expand image capabilities
to read, write and modify images. To read meta data of pictures
taken by digital cameras you need the above mentioned
<link linkend="ref.exif">exif extension</link>.
</simpara>
</note>
<note>
<simpara>
The <function>getimagesize</function> function does not require the GD extension.
</simpara>
</note>
</para>
</preface>
<!-- }}} -->
&reference.image.setup;
&reference.image.constants;
&reference.image.examples;
&reference.image.reference;
</book>
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-->
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