[argyllcms] Re: Xorg video card lookup tables, tone response curves, etc

Samer Abdallah wrote:


** having just written this, I looked up specs for some LCD tv's and
some of them claim 5000:1, even 8000:1 in some cases. Well, I
don't know how they measure this and whether or not it is accurate,


It's typically a fake number as far as I understand. Most displays aren't
capable of simultaneously displaying colors with such a contrast ratio,
and other factors (such as ambient light and/or light from the display itself)
typically limit the maximum practical simultaneous contrast ratio.
So they fake it by adding an iris to a projector, or varying the the
backlighting dynamically, so it is only real if you measure white and black
separately while excluding all ambient light.

Graeme Gill.

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