> Thanks Nicolas, i'll take a look for that and try to understand it, if > there is not exist one open source, i just can try to do it byself. :) The libPNG is open source (watch on http://www.libpng.org) and I have an OCaml implementation available on the MotionTwin CVS (in ocaml/swflib/png.ml) which is a single 11KB file. Best, Nicolas