grass CELL -> ppm?

Does any one have experience/recommendations on converting GRASS
graphics written to a CELL monitor into a format the ppm utilities
can use? Grayscale is no problem: rawtopgm turns an uncompressed
GRASS raster directly into a pgm (grayscale) file, but I don't see
how to make a conversion for color graphics. I know there's a
corresponding rawtoppm routine, but I can't get it to work.

Any ideas or pointers appreciated.

Neel Smith
nsmith@abacus.bates.edu