🚀 go-pugleaf

Re <9301010700.AA07909@raisin-nut>
<ROSE.92Dec31104330@t524i2.telematik.informatik.uni-karlsruhe.de>:

> I have a problem when displaying colored PostScript pictures
> created with Mathematica. Within these files, lots of different
> colors are declared using the "setrgbcolor" operator. However,
> when viewing the file using Ghostscript rel. 2.5.2, I only see a 
> very limited amount (e.g. 8-30 colors; these are the results
> when converting the file to ppm or gif and viewing it using "xv"). 

How are you converting it to PPM?  If you use the pstoppm utility,
the color choices are governed by a predefined palette of 256 colors
in pstoppm.ps.  Colors other than those in the palette are
approximated with halftones of the 8 primary colors.

Conversion to GIF uses a different fixed 256-element palette based on
3 bits of R, 3 bits of G, and 2 bits of B.

If you really want 24-bit color output, simply specify PPM output on
the command line, e.g.,
	gs -sDEVICE=ppm -sOutputFile=something.ppm something.ps
(You will have to recompile Ghostscript to add this driver to it.)

L. Peter Deutsch :: Aladdin Enterprises :: P.O. box 60264, Palo Alto, CA 94306
ghost@aladdin.com, ...decwrl!aladdin!ghost ; voice 415-322-0103 ; fax 322-1734
	    "Implementation is the sincerest form of flattery."