How to tell whether a monitor is colour or not

[kevin at stl.stc.co.uk]

Does anyone know how to tell whether a Sun-3 has a colour board attached
or not? What I want to do is something like this:

if ( colour_sun ) then
	screendump|rasfilter8to1|lpr -v
else
	screendump|lpr -v
endif

Any ideas? Please Email if possible. Thanks in advance,
Kevin

Kevin Lewis 				STC Technology Ltd	
+44 279 29531 ext 2579			London Rd, Harlow 
kevin at stl.stc.co.uk     		CM17 9NA   
(JANET)  kevin at uk.co.stc.stl     (UUCP) ...uunet!mcvax!ukc!stl!kevin