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Originally Posted by Chuck Yokota
So, if optical red creates the illusion of the brightness of the adjacent light area in the minds of the viewers, does that mean it's just a pigment of their imagination?
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In a way you could say so.
When you look at a strong light, say from a car in the night, you would not be able to see anything close to the light source. The yellow light, from the car, will radiate and color the area around the light spot, and the light will look bigger than it is. This is real light behavior.
In a painting you can make the same "effect of blinding" by obscuring the area around the lit part. When done with red color, that is a condensed yellow light color, you will perceive your impression as if you were blinded by the strong light reflected from the object.
I think, Allan