RE: color perception differences between eyes
RE: color perception differences between eyes
- Subject: RE: color perception differences between eyes
- From: Dan Margulis <email@hidden>
- Date: Tue, 28 Jul 2009 13:56:50 -0400
Roger writes,
Bob,
Could the difference you note be a function of the types of
primaries each
Wright and Guild used in their apparatus: Wright used monochromatic
primaries while Guild used wideband primaries? Pretty sure I heard
some
comments to that effect in explaining the differences.
In the last few years, after having questioned hundreds of
experienced people about what they were seeing, I am beginning to
suspect that humans don't calibrate to a white point as such.
Chromatic adaptation has so many levels that we are never going to
understand it entirely. There can be several types going on
simultaneously. Nevertheless, the more I look at it the more it seems
to me that the primary range that the eye relies on is not a light
neutral but rather a lightish warm gray, something on the order of
75L10a15b. Some really interesting perceptual stuff goes on in that
range; for one thing, humans appear to see this range as
significantly darker and more colorful than a spectrophotometer does.
This makes sense from an evolutionary POV. I can't think of any
reason why it helps survival to be able to distinguish closely
similar whites from another. In the warm-yellowish gray range,
however, live a lot of things that we consider good to eat as well as
a number of others that consider *us* good to eat. If evolution has
programmed us to have more acute perception of this range it would
not be startling.
If true there are a lot of ramifications for color correction,
sharpening, and profiling. I'm not saying that it is true, but a lot
of what I am doing is consistent with it being true.
The conventional wisdom is that we adapt to the ambient lighting in
order to perceive it as neutral. If instead the adaptation is to
guarantee that a warm gray is seen as a warm gray, one can understand
how the conventional wisdom became conventional: on casual
examination, both theories produce about the same result. But it
might explain the nagging inability to explain differences in
perceiving white points.
Dan Margulis
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