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Re: Profiling a Dell UltraSharp 2405FPW LCD


In a message dated 7/29/05 10:06:56 AM, email@hidden writes:



I think this is a missunderstanding.
Roger writes about tools helping the user to reduce the Brightness on the display buttons while measuring and giving the user the actual bLuminancee in cd/qm.

Toby writes about reducing the brightness by Software.



I'll take that one step further: be it a display button or not, any method of reducing the brightness that is not seperate from the available 256 levels per channel controlled by the videocard will lose levels as brightness is decreased via this method. Any method that has its own 10 bit or higher 'cache' (preferably 12 or higher) to use in adjustment can compensate for this and avoid visible banding. Any method that is analog, like backlight adjustment, transcends this limitation. So the way to find out if a given control can reasonably used for this purpose is to reduce it to an extreme degree, and see if visible banding occurs; if so, it is probably sharing levels with the videocard LUT adjustments, and you probably don't want to make major luminance adjustments there.

C. David Tobie
Product Technology Manager
ColorVision Inc.
email@hidden
www.colorvision.co 
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