These datasets are character vectors defining PostScript procedure code for
setting the color in output from the PostScript printer driver. They are the
same except that
ps.setcolor.hsb
uses the sethsbcolor operator in
PostScript and
ps.setcolor.rgb
uses the setrgbcolor operator.
Each procedure expects an integer on the PostScript stack. The integer is used
to index (starting at 1) into the Colors array to get the color
specification. If the resulting color specification is a single number, then
it should be interpreted as an explicit gray level value (0=black to 1=white).
If the color specification is not a single number, it will be interpreted
according to the appropriate color model (RGB or HSB).
Adobe Systems, Inc. (1990). PostScript Language Reference Manual, 2nd. ed. Reading, Mass.: Addison-Wesley.