Here again an indication of free eBooks. The computer magazine Chip, in his download section has a free e-book bundled with various topics related to image manipulation with Photoshop CS 4 ready.
Just the right processing of images is not just for the simple digital opportunities. Since good information and background knowledge is important.

Who will Browsed from time to time in the range of Open Books by Galileo Computing have certainly been discovered. The guide to Ubuntu / GNU Linux 9.04 "Jaunty Jackalope" in the 4th Edition. Who wants to deepen his knowledge of the popular Linux distribution should look at it strictly. Important information about photo management and image processing are described in the graphics and image processing read.