And lo on Fri, 02 May 2008 14:04:21 +0100, Invisible <voi### [at] devnull> did  
spake, saying:

>>> Adjusting sensitivity of the optical sensors (the sensors itself, not  
>>> just the iris).
>>  Isn't that what dark adaptation is? Essentially your brain increases  
>> the amount of gain when there are low levels of light.

Try the link below to demonstrate how the brain also adjusts contrast.

http://www.michaelbach.de/ot/lum_contrast-adapt/index.html

-- 
Phil Cook

--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com

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