Optical Illusions Etc...: Color-constancy illusion

Description Presented here is a vast gallery of many different forms of Optical Illusions. Whether these optical illusions are conveyed through fractals, photographs, architecture, art, or old fashioned pen and ink, they are bound to remind you that "seeing is not believing."

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Monday

Color-constancy illusion

I have seen this illusion many times and for some reason never focused on it. I must have past by this optical illusion a dozen times before finally focusing on an article and reading what it is about. It is very similar to the checkershadow illusion but involves color rather than just shades of gray.

Image Copyright Dale Purves, R. Beau Lotto and Surajit Nundy.

The "blue" tiles on top of the left cube and the "yellow" tiles on top of the right cube are actually the same shade of gray. If you use an eye dropper tool to fine the red, green, blue values of each square you will find the value is not precise across any square but they are all definitely grey with a RGB value around R142 G149 B157.

Another interesting tidbit is that the red tiles on top of the left cube are orange and the red tiles on the top of the right cube are purple.

To read more about this illusion read either of these articles: American Scientist: Why We See What We Do and Discover Magazine: Sensory Reflexes.

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