Main Authors:
    Sven Neumann <sven@gimp.org>
    Daniel Mack <daniel@yoobay.net>

HDL mode for gif2blm based on a patch from
    Tino Schwarze <tino.schwarze@informatik.tu-chemnitz.de>

HDL images for blm2gif taken by Dorit Guenter and Nadja Hannaske
and edited by Björn Barnekow.