ImageMagick
ImageMagick is a free software suite for the creation, modification and display of bitmap images. It can read, convert and write images in a large variety of formats. Images can be cropped, colors can be changed, various effects can be applied, images can be rotated and combined, and text, lines, polygons, ellipses and Bézier curves can be added to images and stretched and rotated.ImageMagick is free software: it is delivered with full source code and can be freely used, copied, modified and distributed. It runs on all major operating systems.
Most of the functionality of ImageMagick can be used interactively from the command line; more often however, the features are used from progams written in the programming languages Perl, C, C++, Python or Java, for which ready-made ImageMagick interfaces (PerlMagick, Magick++, PythonMagick and JMagick) are available. This makes it possible to modify or create images automatically and dynamically.
GraphicsMagick is a fork of ImageMagick 5.5.2 which is intended to provide a more stable interface.
