The Free & Open Source Image Editor

GIMP is a powerful program, and is comparable to Adobe Photoshop. You will need to take some time to learn how to use it.

GIMP comes with a built-in help system. Once you start the program, press F1 for context-sensitive help. You may have to install the help pages from a separate package (gimp-help), depending on how your version of GIMP was packaged.