CL-PNG is a Common Lisp package for reading and writing PNG (Portable Network Graphics) files. CL-PNG was originally written by Harald Musum, and is now maintained by Vebjorn Ljosa . New versions can be found at . Copyright (C) 2001--2004 by the authors (see the file AUTHORS). Licensed under the GNU Lesser General Public License; see the file COPYING for details. See doc/index.html for documentation.