Check out the books ina bookstore if at al possible. Scott kelby and Martin Evening have very different writing styles; while Scott is very humourous( depending on your taste) he is not as organised as Martin Evening. Certainly they are the best knpown authors. Personally I recommend getting both.
However can I recommend my real preference for learnig photoshop: I MUCH prefer using DVDs as a from of training, you can follow along on the computer and see/do works best for me.
Google:Katrin Eisman amd Chris Orwig. They both produce excellent dvds. I have asked my local library to stock their dvds and they have been happy to get them in
I have to confess that I have a full bookshelf of photoshop books and have not read even one of them although I have occasionally dipped into them. I just fall asleep whenever I read technical books but I didnt discover that until after I bought them! lol
That's why I recommend dvds (especially Martins!)
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Mac PPC Dual 2.3, 6GB Ram, LR2.5 , PsCS4 11.0.1, 5Dmk2 fw 1.1.0,