GIMP (GNU Image Manipulation Program) is a freely distributed piece of software suitable for such tasks as photo retouching, image composition and image authoring. It is a powerful piece of software with capabilities not found in any other free software product. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.
GIMP is modular, expandable and extensible. It is designed to be augmented with plut-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.
From the user's point of view, GIMP 2 is fundamentally similar to GIMP 1; features available in the older version are still available in GIMP 2.0. However, a huge amount of work has led to a complete restructuring of the GIMP internals. The GIMP 2 code base is significantly better organized, more maintainable and more easily extended than was the case for earlier versions.
Note: You will need to download both GTK+ Runtime Environment and The Gimp installers. Install GTK+ before installing The Gimp.