By opening this picture in Photoshop, one can directly read the RGB
pixel values at any point in the picture. This directly yields the
triplet (120,120,120) for pixels within both squares A and B. I'm
sure there are other programs, besides Photoshop, that can do the same
measurement (eg, Windows' Paint program?).
Bob Sciamanda
Physics, Edinboro Univ of PA (Emeritus)
www.winbeam.com/~trebor
trebor@winbeam.com
----- Original Message -----
From: "Polvani, Donald G." <donald.polvani@ngc.com>
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
Sent: Tuesday, July 17, 2007 8:08 AM
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
| _______________________________________________
| Forum for Physics Educators
| Phys-l@carnot.physics.buffalo.edu
| https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
|
|
|
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