Articles pages: (The articles are just for graphic editing software engineer to accumulate knowledge to design better software for the end customers. They are not well-organized.)
Related knowledge of photo editing software:
Book: Photoshop CS2 techniques to deal with digital photos professional
Use photoshop to modify photo background
Photoshop Effects: The Golden Horse Prairie
Mark 101 Totally Awesome Photo Tips in Photoshop
Aoao Photo Editor V3.1 ?? powerful and comprehensive photo editing software free green