"Warp" <war### [at] tagpovrayorg> wrote in message 
news:473f3242@news.povray.org...
> Rune <aut### [at] runevisioncom> wrote:
>> For example, the eyes have an edge detecting layer I think, or something
>> along those lines. This layer could find all the edges of the bars in 
>> your
>> image and send information about these edges on to the brain, so that the
>> brain can tell how many bars there are. The eyes also send the actual 
>> "raw"
>> brightness info on to the brain, but this may be in a "low resolution" 
>> where
>> no more than 16 different shades can be told apart. However, the brain 
>> can
>> still count all the bars, becuase of the edges detected in the eyes.
>
>  I'm quite certain that if it was an animation where each frame is
> completely filled by a shade of gray and was played eg. at 1 FPS, you
> could clearly see the change.

That might be one test, but it still makes it easy for the brain by showing 
transitions.

What if you had a test that didn't allow the eyes/brain to calibrate from 
frame to frame?

What if your vision was blanked for a time (eg. half-second or second) 
between each successive frame?  How many grey shades could you distinguish 
reliably?

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