http://www.ostraining.com/courses/class/tools/gimp-part-2?task=view
In this second part of a four part series, Vicki continues exploring the power of Gimp. If you're looking for a great open source (free) alternative to Photoshop, Gimp is a great choice!
GIMP stand for “GNU Image Manipulation Program”. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
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Read Source: OSTraining – Gimp Part 2: Colors, Effects, Exposure»