Re: Monitor brightness setting

On Jul 17, 2009, at 11:28 AM, Marco Ugolini wrote:

> Well, my sense of this is that a yellowing of the lens would be  
> compensated by the human visual system's ability to adapt to the  
> perceived white point, effectively neutralizing the yellow cast of  
> the lens itself.

That is the case up to a certain point. At some point it does seem to  
cause a neutrality bias, so that advanced cataract sufferers, given  
controls to "neutralize" a black and white image will make it very  
blue...
> Besides, when the lens darkens, unless it darkens a whole lot, I  
> would also think that the decrease in transmitted light would be  
> compensated for by a corresponding dilation of the pupil. No?

Yes, within the eye's capability to adjust, it adjusts. And beyond  
that it acclimates, though the quality of color vision is reduces, and  
the rods start kicking in at a higher light level...

C. David Tobie
Global Product Technology Manager
Digital Imaging & Home Theater
CDTobie@xxxxxxxxxxxxx

Datacolor
www.datacolor.com/Spyder3

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