Preserving black bg in color Postscript

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Please help with the following simple question.

I have several color plots on black background. To
preserve the background color when converting the
NCGM file to color PostScript, I tried

ctrans -d ps.color -simulatebg gmfile > gmfile.ps

However, when I used ghostview to view the resulting
color PostScript file, the background is not black.

Does the option -simulatebg only take effect when
sending the resulting to the color printer but not
when viewing using a PostScript viewer?

I have not tried to print the resulting file yet
since it's kind of big and I'm not sure it would
appear as intended (colors on black background)
in hard copy.

Cam Tran (trancv AT unknown)
NRaD - Code 761
San Diego, CA 92152-5000
_______________________________________________________

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