Newsgroups: sci.image.processing
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From: skroeker@netcom.com (Steve Kroeker)
Subject: Color Mapping of B&W Images
Message-ID: <skroekerD0vpFv.HnF@netcom.com>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Date: Fri, 16 Dec 1994 00:59:55 GMT
Lines: 25

Hello,

I have some raw 8-bit images that I want to pseudo-colorize.  I want the
highest values to be yellow and the lowest values to be blue.  I have done
that successfully already.  But the problem is I want to move around the
color circle (i.e. B, C, G, Y, R, M, and back to B). My desire is that as
values fall off from the highest values (i.e. 255) they should move through
the red and magenta on the way to blue for the darkest values.
Most texts I have looked in discuss moving from CIE to HSV to RGB to ???.
I'm starting with monochrome and want to go into color space and move about
the color wheel in a precise manner.
I have built by hand some LUT to do this function but they are not smooth.
I have generated a 21 step gray scale that I append to the image and in
color it is not smooth.  
I've tried to derive a function/functions and they all have flaws.

Thanks for any mapping tips.

Steve Kroeker
Fairfax, Virginia
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