Mark is a relative newcomer to serverside programming, though he's already showing competence - especially in the area of image manipulation. His recent acquisition, teckis.com is planned as a portal for distributing PHP snippet codes and possibly some complete systems as well.
Image Manipulation with PHP – The GD Libraries
The GD Libraries are the principal tool used for image manipulation in PHP. If your version of GD is below V2.0, Mark’s handy tutorial will show you how to create and manipulate images quickly and easily.