Great book for Open Source Photographers,
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This review is from: The Book of GIMP: A Complete Guide to Nearly Everything (Paperback)
This is a great book for any one who wants to move from Photoshop to Gimp. The fact that you can download the exercise files so that you too can play along is a great bonus. This is not a beginners book but it has convicned me that GIMP can do 90% of what Photoshop can (In my humble opinion). There is a great section filters and what how each one works. One of the best books I have bought.