Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!bionet!ames!lll-winken!uunet!hodge!jdm
From: jdm@hodge.UUCP (jdm)
Newsgroups: comp.graphics
Subject: Gray levels and color
Keywords: color gray
Message-ID: <20722@hodge.UUCP>
Date: 14 Jul 89 01:14:58 GMT
Organization: Hodge Computer Research Corporation
Lines: 37


In a company I onced worked for there was a guy who could
look at a black and white photograph of a prinited circuit board
and read the color codes on the resistors, capacitors, wires, etc.
I could look at the same photograph and make an educated guess
of what the colors were based on the intensity of the gray levels
and the most likely color combinations that would occur on a
PC board, but I could not read them with 100% accuracy like
this guy could.

It turned out that this guy was color blind in such a way that
he could see colors in levels of gray.  Apparently they were the
correct colors for he never seemed to need to guess or deduce.
He actually saw those colors on the B&W photograph.  Now I am
wondering "just what are the correlations between intensity
(levels of gray) and color (either RGB or HSI)"?


Reducing the Hue and Saturation in a photograph would leave only
a gray level picture of the intensities.  How would one use such
an intensity scale to reconstruct the orginal color of the 
photograph using either RGB or HSI?


-- 

"I'm an anthropologist, not a computer systems architect, damit!"

jdm@hodge.cts.com [uunet zardoz]!hodge!jdm

James D. Murray, Ethnounixologist
Hodge Computer Research Corporation
1588 North Batavia Street 
Orange, California 92667  USA

TEL: (714) 998-7750	Ask for James
FAX: (714) 921-8038	Wait for the carrier