Again using Photoshop (or some other such program) one can crop this
picture and produce two sub-pictures, each of which shows just the
square A or the square B, without their surroundings. Viewing these
two pictures side by side, one sees that they are obviously the same
shade of gray.
Bob Sciamanda
Physics, Edinboro Univ of PA (Emeritus)
www.winbeam.com/~trebor
trebor@winbeam.com
----- Original Message -----
From: "Bob Sciamanda" <trebor@winbeam.com>
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>
Sent: Tuesday, July 17, 2007 9:02 AM
Subject: Re: [Phys-l] An Unsolved Color Problem
| 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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| _______________________________________________
| Forum for Physics Educators
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