Features
Full suite of painting tools including brushes, a pencil, an airbrush, cloning, etc.
Tile-based memory management so image size is limited only by available disk space
Sub-pixel sampling for all paint tools for high-quality anti-aliasing
Full Alpha channel support
Layers and channels
A procedural database for calling internal GIMP functions from external programs, such as Script-Fu
Advanced scripting capabilities
Multiple undo/redo (limited only by disk space)
Transformation tools including rotate, scale, shear and flip
File formats supported include GIF, JPEG, PNG, XPM, TIFF, TGA, MPEG, PS, PDF, PCX, BMP and many others
Selection tools including rectangle, ellipse, free, fuzzy, bezier and intelligent
Plug-ins that allow for the easy addition of new file formats and new effect filters