On Sun, Feb 21, 2016 at 3:45 PM, Gunnar Swanson <[log in to unmask]>
wrote:
> > hue is stable even in very different wavelengths of light due to a
> visual process of comparative differences.
>
​correction -- not to Gunnar, but to my sentence which he quotes.
It should read "perceived hue is stable even in very different wavelengths
of light." The word "perceived" is critical here. My error.
I would also reword the whole thing to say perceived hue
remains remarkably constant under a wide variety of spectral distributions.
--
And as Gunnar points out, because the eye has three receptors, each of
which responds to a wide range of light frequencies, lots of colors match
perfectly even though the spectral reflectances of the objects being
perceived are very different. All that matters is that the amount that each
of the three receptors in the eye receive are the same.
The opposite happens as well: two colors that match perfectly under one
kind of light will look different under another (as Gunnar points out).
Color is fun.
(Let me remind those few readers still following this stream, that all of
these phenomena are extremely well understood and can be predicted with
great accuracy.
Don
​
Don Norman
Prof. and Director, DesignLab, UC San Diego
[log in to unmask] designlab.ucsd.edu/ www.jnd.org <http://www.jnd.org/>
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