explain.

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cain

Banned
Aug 1, 2003
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Originally posted by: dighn
Originally posted by: cain
you took a piece of napkin, cut two holes and superimposed it on your screen?

yeah...

hmmm did that, the B block is slightly lighter than A, but i suppose that's because i didnt block out the entire screen

edit: yeah they are the same
 

purbeast0

No Lifer
Sep 13, 2001
53,538
6,365
126
lol ... another proof :p

Text

I even pasted the B square in the middle of other squares so you can see the affect that the surrounding squares have on your perception of the color.
 

newParadigm

Diamond Member
Jul 30, 2003
3,667
1
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Here thou goest.

Go here has a complete explantation and covers and everything.

http://www.michaelbach.de/ot/lum_adelson_check_shadow/index.html

You will, in all likelihood, perceive the above picture as a 3-dimensional scene, where a greenish cylinder stands on a checkered pane; light comes from top left. Now try the 2 buttons on top right. Two patches will be indicated, judge their relative brightness. A second later the patches will be isolated out of their context and now the brightness will be identical, luminance was identical all the time.