(a2ps.info)Colors in PostScript

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8.4 Colors in PostScript
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Nevertheless, here are some tips on how to design your PostScript
styles.  It is strongly recommended to use 'gray.pro' or 'color.pro' as
a template.

   There are two PostScript instructions you might want to use in your
new PostScript prologue:
'setgray'
     this instruction must be preceded by a number between 0 (black) and
     1 (white).  It defines the gray level used.

'setrgbcolor'
     this instruction must be preceded by three numbers between 0 (0 %)
     and 1 (100%).  Those three numbers are related to red, green and
     blue proportions used to designate a color.

   a2ps uses two higher level procedures, 'BG' and 'FG', but both use an
argument as in 'setrgbcolor'.  So if you wanted a gray shade, just give
three times the same ratio.