Datacolor User to User Support Group.

Projectors are totally different animals.  Black luminance for  
projection is not set by the projector, but by the ambient light.  
White is set by the projector, in a properly darkened room, so  
effectively that a pink or green wall will appear white when projected  
upon.

You can use Spyder3TV to set the hardware controls on your projector,  
but the number of such controls is limited when hooked to a computer,  
and even more limited when in digital mode.

The approach Spyder3Elite takes is to leave the hardware setting alone  
(ideally at defaults), let the room and the eye define those factors,  
and simply profile the result, with or without VLUT gray balancing.  
With seems best for LCD projectors, without for Texas Instruments  
projectors.

C. D. Tobie
Global Product Technology Mngr.
Digital Imaging & Home Theater
Datacolor.com
CDTobie@...

On Feb 14, 2009, at 9:30 AM, Nathan Gutman <nzgutman@...>  
wrote:

> Thanks, can you also amplify how does this apply to calibrating a  
> projector?
> Nathan
>
> Cdtobie wrote:
>>
>> With CRT displays, there were controls for both contrast and  
>> brightness, and the most effective way to avoid clipping at either  
>> end while doing a visual, not measured calibration, was to adjust  
>> until the four squares were visible.
>>
>> For LCDs this is seldom an issue. First, on less expensive displays  
>> there may be clipping at all settings. And with the types of  
>> controls on many LCDs, clipping may not occur at any setting.  
>> Besides, most LCDs have no control to adjust the blacks, and whites  
>> on them are so bright that luminance is not set to just below  
>> clipping, it's ideally set way down from full brightness, through a  
>> targeted white luminance value. Targeted white and black luminance  
>> values are measured with the Spyder, not set visually.
>>
>> To put of much more simply: if you don't like making visual  
>> adjustments, select measured, not visual mode. Then your setting  
>> will not come from the four visual squares, but from Spyder  
>> measurements you take later in the calibration process.
>>
>> C. D. Tobie
>> Global Product Technology Mngr.
>> Digital Imaging & Home Theater
>> Datacolor.com
>> CDTobie@...
>>
>> On Feb 13, 2009, at 8:24 PM, Nathan Gutman <nzgutman@...>  
>> wrote:
>>
>>> I am still learning... learning...
>>> Spyder hardware is supposed to eliminate the visual judgment  
>>> needed when using calibration software such as Adobe Gamma or  
>>> QuickGamma.
>>> But when using Spyder I am asked to visually inspect four white  
>>> squares and four black squares and adjust monitor brightness and  
>>> contrast accordingly.
>>> Isn't this predicated on the visual acuity of the observer?
>>> Can someone please explain?
>>> Thanks,
>>> -- 
>>> Nathan Gutman
>> =
>
> -- 
> Nathan Gutman
>
>
>