Mike,
> On Feb 21, 2016, at 1:42 PM, Paul Mike Zender <[log in to unmask]> wrote:
>
> the context of a color changes its visual appearance.
Anyone who doubts it should look at the smaller rectangle in:
http://gunnarswanson.com/GradientIillusion.jpg
and then cover up the larger rectangle so only the smaller one is visible.
> hue is stable even in very different wavelengths of light due to a visual process of comparative differences.
Color constancy is. . . I think the technical term is "damned weird." An example:
http://www.gunnarswanson.com/GraySquareIllusion.gif
But you don’t need the same reflectance curve to produce the same retinal response so apparent hues can match perfectly in a given lighting condition then not match under other light. It’s called metamerism.
Gunnar
Gunnar Swanson
East Carolina University
graphic design program
http://www.ecu.edu/cs-cfac/soad/graphic/index.cfm
[log in to unmask]
Gunnar Swanson Design Office
1901 East 6th Street
Greenville NC 27858
USA
http://www.gunnarswanson.com
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+1 252 258-7006
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