PHP Image Workshop is an open source class using GD library that helps you to manage images with PHP. It requires PHP version 5.3+ and it’s thought like photo editing software (Photoshop, GIMP etc): you can superimpose many layers or even layer groups, each layer having a background image. This makes it very flexible.
This library is thought to do simple tasks like creating thumbnails or pasting watermarks and also to do more complex tasks (multiple superimpositions, image positioning and more).
An example of what this library can do can be seen below: adding a simple copyright watermark to an image.