I don’t agree that using a color picker for a single pixel is scientific.
The checker shadow illusion is an optical illusion published by Edward H. Adelson, Professor of Vision Science at MIT in 1995.
The image depicts a checkerboard with light and dark squares, partly shadowed by another object. The optical illusion is that the area labeled A appears to be a darker color than the area labeled B. However, within the context of the two-dimensional image, they are of identical brightness, i.e., they would be printed with identical mixtures of ink, or displayed on a scre...
A and B are the same shade of gray (#707070 ) according to a color picker, but absolutely not to a human brain.
Can you see any purple here, where I simply compressed the levels a bit?
I see the same effect in both images; this is just more exaggerated.
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