Digital BW, The Print

In a message dated 12/2/06 8:08:06 PM, wpajohnson@... writes:


> I think when it is very dark we only see in grays.
> So possibly we do have some processing in our brains for B&W.
> 

We have two entire image processing systems: Red, Green, and Blue sensitive 
cones for color, and monochrome rods for B&W. Being "unfiltered" the rods are 
more sensitive, so we depend on them for night vision, when our color vision 
fails. The rods see things as quite cool (blue), so when the two types of vision 
mix, the rods add a blue component. This is why at low room light you 
calibrate a low luminance CRT to a much yellower 5000k whitebalance ( to compensate 
for this blueness), and at moderate room lighting, you can calibrate a much 
brighter LCD to a 6500k whitebalance, for similar visual results. That is one of 
the factors that the ambient light feature in Spyder2PRO adjusts for...

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com


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