Re: LCD Monitors

[CDTobie@aol.com]

In a message dated 6/12/02 6:05:43 PM, dickbo@btopenworld.com writes:

>Intresting you say all that because some weeks ago I decided to ColorVision
>
>my monitor profile by using the display cards software controls, and the
>
>truth is I could not do it because although the card software allowed far
>
>more movement on white and black point settings they appeard to be beyond
>
>the spyders ability to read them. At the same time RGB adjustments could
>not
>
>be done when using the colour visions software.
>
>
>
>Although the cards driver software appeared to have a much wider range
>of
>
>screen visual change options you simply could not use them to calibrate
>a
>
>monitor profile.
 
There are some odd statements (or some odd wordings, its not always possible 
to distinguish) in the above post. The most video card drivers can do for an 
LCD is to set the black to allow no light through, and white to allow the 
RG&B to be fully exposed (or at least one set to full, and the other two 
damped down to provide the desired white balance), and to allow maximum Red, 
Green and Blue individually as well (plus set a gamma and smoothing curve for 
each channel, whichi is what the video card download from the profile 
utilizes). Anything less than this is a  reduced gamut or reduced range. On 
the other hand, the  engineers responsible for the actual LCD monitor 
settings tend to determine effective settings quite well, so the default 
front panel settings often offer optimal range and color, or close to it. The 
Spyder can read any brightness up to well beyond 200 candelas, and colors as 
far out as LCDs can manage, and blacks down to, well... down to where no 
light emissions can be sensed. So how could messing with how your video 
driver defines 0 to 255 in the three channels somehow exceed the Spyders 
ability to read the screen? I don't doubt that messing with these controls 
could get you a lousy result; only that this lousy result is the fault of the 
Spyder being unable to read what the video driver is sending, which is simply 
numbers between 0 and 255 in three channels. Its the monitor settings that 
make those numbers into colors and range on the screen.

C. David Tobie
Design Cooperative
CDTobie@designcoop.com
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