There's also RMagick http://home.nc.rr.com/rmagick/ which can do some
drawing as well (some nice examples here:
http://home.nc.rr.com/rmagick/portfolio3.html ) . It's based on
ImageMagick.

Farrel
-- 
Data Network Architecture Research Lab    mailto:flifson / cs.uct.ac.za
Dept. of Computer Science                 http://people.cs.uct.ac.za/~flifson
University of Cape Town                   +27-21-650-3127