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From: pswisnov@phoenix.UUCP
Newsgroups: comp.graphics
Subject: RGB color table setup.
Message-ID: <248@phoenix.PRINCETON.EDU>
Date: Sat, 18-Apr-87 16:41:18 EST
Article-I.D.: phoenix.248
Posted: Sat Apr 18 16:41:18 1987
Date-Received: Sun, 19-Apr-87 08:09:17 EST
Reply-To: pswisnov@phoenix.UUCP (Peter S. Wisnovsky)
Organization: Princeton Univ. Computing and Information Technology
Lines: 18

I would imagine that this question has been asked a number of times before,
but...
I would like to set up a color table on a Sun3 for use in a graphics package.
What I would like would be a smooth cyclic transition across the edges
of the RGB color cube (start and end with, say, red). I am now using
a linear transformation, i.e., hold red at 1, blue at 0, and increase
green linearly from 0 to one to ramp from red to yellow, etc. This is
rather unsatisfactory because, of course, the colors are not linear.

I know what I have to do: implement a gamma function for the ramps, but
I was hoping someone out in netland might have something already implemented
they might be willing to send me. I would greatly appreciate it.

Please use mail! I have just been told that our news software will trash
all news received over a certain period (of a few hours) every day!

Thanks,
Peter