ImageMagick
ImageMagick is a popular "swiss army knife" image manipulation program for the FLOSS world. In addition to a collection of powerful command line utilities, ImageMagick is available via libraries in most of the popular (web) scripting languages.
Installing
Gentoo Linux
You should be able to simply "emerge imagemagick" using Portage. Make sure that "truetype" is enabled in the UseFlags, this allows you to open and use TrueType fonts.
Mac OS X
There is now a "binary distribution" for Mac OS X on the main imagemagick website. You simply unpack the files, move the resulting folder to a convenient location (say in your home directory), then tweak some environment variables so your system can find everything.
Command line Tools
Here's a list of the command-line tools that get installed:
- animate
- compare
- composite
- conjure
- convert
- display
- identify
- import
- Magick-config
- Magick++-config
- mogrify
- montage
- Wand-config