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Re: [Phys-l] An Unsolved Color Problem



Actually, I have now found that there is an explanation for the illusion
if you follow the link to Edward Adelson (MIT Professor of Vision
Science) at the bottom of the image. Professor Adelson provides a
further proof and also an explanation for the illusion by clicking on
his Illusions and Demos link.

Don Polvani
Northrop Grumman Corp.
Undersea Systems
Annapolis, MD

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Polvani,
Donald G.
Sent: Tuesday, July 17, 2007 8:09 AM
To: Forum for Physics Educators
Subject: [Phys-l] An Unsolved Color Problem


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
Northrop Grumman Corp.
Undersea Systems
Annapolis, MD
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