...The main piece of imageprocessing functionality is concentrated in the ImageInterface implementations (one per driver - e.g. Imagick\Image). The main idea of Imagine is to avoid driver specific methods spill outside of this class and couple of other internal interfaces (Draw\DrawerInterface), so that the filters and any other image manipulations can operate on ImageInterface through its public API.
A lightweight PHP implementation of Don Park's original identicon code for visual representation of MD5 hash values. The program uses the standard PHP GD library for imageprocessing.
Asido is a PHP (PHP4/PHP5) imageprocessing solution, with "pluggable" drivers(adapters) for virtually any environment (GD2, Image Magick, etc). Asido does: various resize routines, watermark, rotation, copy images, cropping, grayscale, convert, etc.
Scribe Software is a software system for the nondestructive scanning and digitization of books with the Internet Archive's Scribe machine. The Java UI and PHP imageprocessing pipeline produce books for www.archive.org and other digital libraries.