Re: OT: Can you discriminate between grays?

[Gonz]

I remember reading about this a couple of years ago in a scientific 
journal.  The cover image was freaky like this.  Our eyes/brain do alot 
of processing that may leave information in an ideal state for abstract 
recognition, but its not prepared to do lower level comparisons of 
luminosity/color across these processed shapes.

Rob Studdert wrote:

The images contained the following URLs illustrate colour ambiguity, or how 
easily the eyes and gray matter can be fooled:

http://www-bcs.mit.edu/people/adelson/checkershadow_illusion.html

http://www.uq.edu.au/nuq/jack/Dale%27s%20Illusion1.jpg

http://www.uq.edu.au/nuq/jack/Colorcross1.html

I makes you wonder if naturally occurring illusions may be the reason that some 
images look wrong but are near impossible to quantify why?

Cheers,

Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
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Pentax user since 1986, PDMLer since 1998