Package GraphicsMagick

An ImageMagick fork, offering faster image generation and better quality

http://www.graphicsmagick.org/

GraphicsMagick is a comprehensive image processing package which is initially
based on ImageMagick 5.5.2, but which has undergone significant re-work by
the GraphicsMagick Group to significantly improve the quality and performance
of the software.

General Commands
Command Description
gm command-line utility to create, edit, compare, convert, or display images
Special Files
Special File Description
miff Magick Image File Format
File Formats
File Description
quantize ImageMagick's color reduction algorithm.