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Re: [Phys-l] An Unsolved Color Problem


My artist friend sends this comment:

That is a very cool illusion, but because you have to change pages , there may still be some unbelievers. So I right clicked on the image , saved it in a jpg file format, and re-loaded it in Photoshop. Then I could select the tile B with the color picker. After selecting color B, I selected Color A while watching the screen. There was no jumping or apparent shifting , as there would be if the two color areas varied. In art, the principle is based on extreme color contrasts. In design this principle is known as simultaneous contrast. It works with primary/secondary color pairs (complements such as magenta/cyan) in color theory, and it forms the basis of many of the color relationships in our adjunct faculty member's (Eric Ton's) "pattern" paintings, and it forms the basis of much of the "Op" (Optical) art of the 1960's.

P.S. One of my committee members some years ago was a physicist who studied color perception. The process of how we, as humans, perceive colors is extremely complicated and truly remarkable. Have you ever wondered how those TV announcers who stand in front of a blue screen (to get the weather map behind them) can still show realistic skin tones even though the camera that captures their image has the blue turned off?

Cheers,

Rick


Richard E. Swanson, Ph.D.
Dean of Instruction
Physics Professor
Sandhills Community College, Pinehurst, NC 28374
swansonr@sandhills.edu (910) 695-3715

Brian Whatcott <betwys1@sbcglobal.net> 7/17/2007 12:47:24 pm >>>
At 07:08 AM 7/17/2007, you wrote:

Here is the Astronomy Picture of the Day (APOD) for today July 17,2007.

http://antwrp.gsfc.nasa.gov/apod/astropix.html

I haven't "solved" the problem of how the two squares can appear to have
different colors and yet be the same color, so I have no need of coding
techniques to hide my solution.

I would, however, appreciate an (uncoded) explanation as to how the
squares can appear so different in color to the eye and yet be the same
color from anyone who knows the answer or can figure it out.

Don Polvani


Pattern recognition, like speech recognition is a difficult task for machines.
There are layers of post-processing built-in to the liveware senses that
have to be laboriously discovered or counterfeited for reasonable sensing:
processing of the kind we think is trivial.


Brian Whatcott Altus OK Eureka!


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