[alt.graphics.pixutils] Help with PostScript conversion

tachyon@ucscb.UCSC.EDU (Tane' Tachyon) (10/20/90)

I'm posting this for a friend; please reply to him at
midnight@gorn.santa-cruz.ca.us
 
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Help me, please!
 
I would like to create a file containing RGB triples (0 to 255),
probably 1000 by 1000 or bigger, and be able to take this to a service
bureau of some sort that can produce a color separation (for standard,
four color printing) directly.  The idea here is both that I can avoid
the image and color distortions my screen and a separation from a
print would introduce and that I can get much higher res than my
screen can display.
 
Everyone who can produce separations from disk files wants Postscript.
I can buy a $200 utility that can convert various formats to
Postscript:  Is there a PD (MS-DOS, please!) utility that can do the
same?  Even better, is there one with source, so that I could at least
conceivably muck with it to take a nice simple headerless file that's
just basically a huge array of tuples?  Failing the latter, could
anyone mail me a spec for a 24 bit format like TIFF or Targa?  (I have
.PCX specs and code, but I'd rather use 16M colors than 256!)
 
Thanks  / midnight@gorn.santa-cruz.ca.us