cl-magick
cl-magick is a set of lisp bindings for the ImageMagick graphics library, a comprehensive image manipulation library. It is useful for loading and manipulating almost any image format. The bindings are licensed under the MIT license, and the library itself is under a similar license held by the ImageMagick corporation.

Warning! The headers it is based on are from '06, some imagemagick functions have changed. However, presumably ah2cl.lisp with which is was created with can make newer versions with newer headers. Wish it would allow me to hook into the variable names and such(get rid of camelcase, prefixes easier, wrote one that removed prefixes with a macrohook instead), though.. (ah2cl is included in cl-magick too.)

ASDF-install package (obsolete) http://www.common-lisp.net/project/cl-magick/cl-magick.tar.gz