Re: color calibration of microscopic images

From: Gordon Couger (gcouger_at_NOSPAMprovalue.net)
Date: 09/08/04 

Date: Wed, 8 Sep 2004 03:45:51 -0500

"Repeating Rifle" <salmonegg@sbcglobal.net> wrote in message
news:BD6369EB.22FF2%salmonegg@sbcglobal.net...
> in article Wpd%c.6636$OZ6.2817@okepread06, Gordon Couger at
> gcouger@NOSPAMprovalue.net wrote on 9/7/04 12:25 AM:
>
> > Human perception of color is a very interesting subject. I have a
friend
> > that is red green color blind that can mix paint to match samples
almost
> > perfectly. Certainly better than any of the computers in paint stores.
He
> > was raised in a paint store and because he was color blind no one ever
tried
> > to teach him to mix paint. When he went to college he got a job in a
paint
> > store and one night the computer wouldn't match the sample so he tried
to
> > fix and he could and has been doing it ever since. There is more there
than
> > meets the eye.
>
> I find it very difficult to believe this story. While in certain
situations
> be color blind might help in color discrimination, World War I camouflage
> detection for example, good mixing of paints to match random colors seems
> problematic to imposssible. Is there a reference to such ability?
>
Bill,

I found it difficult to believe as well until I watched him do it. He
doesn't see color as you and I do but he sees something he can match. Of
course he has a color chart that the customer can pick a close match and he
just has to take if from there so it is not as hard as it seems at first
glace. But no one expected he would be able to do that.

The pigments used for paint and the dyes in photographs and the colors in
nature are all different so with paint you can seldom really match anything
but other paint just a no color film truly renders the scene it photographs.
Many people are happy with paint matches far from perfect.

I don't mix paint but I mixed ink in the print shop for years and it is
about the same except in the print shop the paper and printing method affect
the color as well. Matching offset and letter press work in pale color can
be difficult. The ink in the offset press will be darker.

Gordon

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