i found this proggi (includes sources) its an image compressor for 256 color data (aka a gif replacement) was issued in 1998 from JAPAN under GPL
it not like paq in compression ratio but its rather too fast in compression ..
the link is http://ftp.vector.co.jp/pack/win95/art/graphics/co nv/whypic12.lzh
and another on at
its even faster than whypic but not smaller though..
stuffit will relay their image compression engine on it..
and both is supported in viewing in XnView