🚀 go-pugleaf

In article <1991Jun20.053653.20412@sci.ccny.cuny.edu> kly@sci.ccny.cuny.edu (Gregory Kozlovsky) writes:
>
>I would like to create a Postscript file which would be printed
>differently on color and black&white printers. For example, lines
>which have different colors on a color printer should be drawn with
>different dash patterns on black&white one. What is the correct way
>to ask the printer?  I would prefer not to use level 2 features.
>
>          Gregory

Version 49 and later of PS have an operator in statusdict called
"processcolors" which return the number of primary colors known
to the printer at that moment.  For most printers it is 1=monochrome,
3=CMY, 4=CMYK.  This would depend, for example, on the type of transfer
ribbon loaded in a thermal-wax printer.  Although possible, I've never
seen a value other than 1, 3, or 4.

Only 49.0 and later PS versions implement color extension to level 1 PS.

Therefore:

/hascolor {
	statusdict /processcolors known
		{ statusdict /processcolors get exec 1 ne }
		{ false } ifelse
} def

Defines a procedure "hascolor" which returns a boolean "true" if more than
one color is known to the printer, i.e. CMY or CMYK, and false if the PS 
version is too early for color, or is a late version of a monochrome device.


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