cl-netpbm is a pure Common Lisp library for reading and writing the netpbm image formats (PPM, PGM, and PBM).
These image formats are very simple, but not efficient. If you need extreme performance you should not use these formats (or this library).
cl-netpbm can be installed with Quicklisp:
cl-netpbm system provides all the functionality of the library. It has no
cl-netpbm/test system provides the unit tests. It depends on
external-program, and also requires ImageMagick for its fuzz testing.