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:
How to check DPI value of image
Compare PSD photoshop files, free comparison tool
Its here, Upload & Share PDF Files with Google Docs
Overlap & Merge multiple photos with merge tool
Add Frame to photos online: Framer
Aviary online image editing in Google Apps account
Photoshop app to edit photos on Android mobile
Dummy online banner generator tools
Simple & quick image Thumbnail maker
Generate Gradient images of different colors
Smart ways to Print selective parts of webpages
Photo editing and Gestalt Part1
Photo editing and Gestalt Part2