RasterView is a CUPS raster file viewer
for CUPS 1.2 and higher.
It basically allows you to look at the
raster data produced by any of the
standard CUPS RIP filters (pstoraster,
pdftoraster, and imagetoraster) and
is normally used to either test those
filters or look at the data that is
being sent to your raster printer driver.

cupsraster2ppm is a converter to the PPM
image format.