WideImage is a PHP5 image manipulation library with a fluent interface that supports chaining operations and abstracts the normal GD2 operations from the interface into a more coherent and extendable framework.
Asido is a PHP (PHP4/PHP5) image processing solution, with pluggabledrivers(adapters) for virtually any environment. A lot of PHP developers (both on the PHP4 and PHP5 side) need image transformation operations for various tasks, the most mundane of which are the proportional resizing and
... [More] watermarking. Asido offers such solution: uniform API for image transformations that works with various environments (GD, ImageMagick, MagickWand, etc). Asido is open-source and its LGPL license allows you to place the class in your proprietary PHP projects. Asido offers the following functionality: resize images, watermark images, rotate imates, copy images, crop images, grayscale images, convert images, etc. [Less]
Instant Picture Creator is a wrapper to produce images on demand for Web sites. It has filter management, and it's possible to add new filters. It can cache filtered images, works independently (no backend is needed), and is easy to integrate with existing Web sites.
It includes two basic filters
... [More] for resizing images and manipulating colour palettes.
Currently it supports PNG, GIF, and JPEG. [Less]