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From: robdu@syma.sussex.ac.uk (Robert James Duncan)
Newsgroups: comp.sys.mac.programmer
Subject: greyscale video device driver
Keywords: quickdraw, rom, device, driver
Message-ID: <3936@syma.sussex.ac.uk>
Date: 30 Nov 90 12:56:36 GMT
Organization: Univ. of Sussex, Brighton, UK
Lines: 15

I am writing a driver for a greyscale video device and I need to know
how to inform Quickdraw that there is only one output channel instead of
the normal three (red, green and blue).

If I had a fixed linear ramp of greys, then I suppose I could specify
that I was a direct device with each 8-bit pixel consisting of one 8-bit
component.  Does any one know whether this will work, or how to specify
greyscale for a writeable clut, i.e. an indexed device?

Rob.
-- 
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rob duncan, school of cognitive and computing sciences,
university of sussex, brighton, uk. robdu@cogs.susx.ac.uk
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