The GNU Image Manipulation Program (the project that started it all),
described in Chapter 9, "Editors, Text Tools,
Graphics,
and Printing". The GIMP is a
powerful image editing and painting application. It performs common
image manipulation functions such as painting, color correction, and
cropping. It also supports advanced features such as layers and
selections and is extensible via a sophisticated plug-in system. The
plug-ins are separate programs that provide specialized image
manipulation functions or special effects.