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PHP.net Manual
GD Graphics Library
Compiling and Enabling GD in PHP 4.3 by Marco Tabini
An intro to using the GD image library with PHP by Matt Wade
Encyclopedia of Graphics File Formats
PNG (Portable Network Graphics) Home Site
The GIF Controversy: A Software Developer's Perspective
Web Design Group - Image Use on the Web
RGB World: RGB Color Info
Alpha and the History of Digital Compositing by Alvy Ray Smity
Adobe Solutions Network: Font Formats, File Types and Q&A
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