I would avoid the entire ppm->ps->pcl conversion step, since it is possible
to confuse things with the multiple conversions. I'm pretty sure there is
a pbm->pcl filter (pbmtolj), that I use with sendfax, but it may
even be part of the normal netpbm tools. I had set up my magicfilter to
use this instead of going to PS, and then having ghostscript convert back
to raster, because it uses a lot of memory + CPU, and I didn't have a fast
machine back then. Here are the relevant lines in my filter file:
0 P1\n pipe /usr/local/bin/netpbm/pbmtolj -resoution 300 2> /dev/null
0 P2\n pipe /usr/local/bin/netpbm/pgmtopbm 2>/dev/null
0 P3\n pipe /usr/local/bin/netpbm/ppmtopgm 2>/dev/null
0 P4\n pipe /usr/local/bin/netpbm/pbmtolj -resolution 300 2> /dev/null
0 P5\n pipe /usr/local/bin/netpbm/pgmtopbm 2>/dev/null
0 P6\n pipe /usr/local/bin/netpbm/ppmtopgm 2>/dev/null
As you can see, it converts color/grayscale to b&w first, and then prints.
Now, this works fine with my LaserJet, but I'm not 100% sure on the DeskJet
if it supports PCL. If it doesn't, you may need to use a different back-end,
but it is relatively easy to do, since the data is guaranteed to be in raster
format, which the printer can handle, with a few codes.
Cheers, Andreas
--
Andreas Dilger University of Calgary \"If a man ate a pound of pasta and
Micronet Research Group \ a pound of antipasto, would they
Dept of Electrical & Computer Engineering \ cancel out, leaving him still
http://www-mddsp.enel.ucalgary.ca/People/adilger/ hungry?" -- Dogbert
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