CL-PNG used to be called PNG, and was originally written by Harald Musum?. It is now maintained by Vebjorn Ljosa, and can be downloaded from http://www.ljosa.com/~ljosa/software/cl-png/.
Version 0.4 was released on 2004-03-06.
Whereas version 0.2 contained a Lisp implementation of zlib, version 0.3 and later use UFFI bindings to libz. As a consequence, encoding PNG files is much faster than before.
Versions 0.2 and older can still be downloaded from http://www.pvv.ntnu.no/~musum/lisp/.
Download ASDF package from http://www.ljosa.com/~ljosa/software/cl-png/download/cl-png-0.4.tar.gz
This page is linked from: PNG Vebjorn Ljosa
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