AVS Forum Special Member
Join Date: Apr 2000
Location: The Wilds Of Canada
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When digitally based projection systems mangage to get TRUE black level, or something so close to it that it nearly a given, then white screens could easily and properly be used with that projection system.
My main comment with the usage of the current examples of digitally based projectors requiring the grey screens deals with the human visual mechanism and the 'falsification' of a 'apparent' black level, thus bringing about a 'apparent' better image with the use of a grey screen. If true cut off is achieved with one of these projection systems, then white once again becomes a extemely valid choice.
CRT= infinte black level, and lmited output, thus white is valid.
Digital= limited black level and an extremely high white level, thus grey is valid, instead of black, as the white level is NOT infinite, and neither end of that scale is 'locked down' as it is in the crt.. the black level.
Due to the 'floating' (meaning well off of a true black, I fully realize that it does not float or move about) characteristic of the black level, and the non-infinite white level, there will have to emerge many different values of grey if the market is to be properly outfitted with the screens that are required for all those different black level/lumen count differences between the various projectors.
what I mean is one man's perfect grey is another man's poor choice.
It MUST be fitted to your projector. A limited range of output means that grey matching is CRITICAL to getting the greatest contrast range possible out of your projector. Compared to a CRT, (at this time) you have very little headroom or room to move in this regard.
I hope to be able to send out 'grey level matching' kits. This aspect is critical for folks. I do not think at this time that the average user or grey screen prospective buyer realizes how critical it is.
That limited contrast range can be destroyed even further by a poor grey choice. you don't need to take a barely realized 300:1 contrast range and halve it by making a poor grey choice.
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[This message has been edited by KBK (edited 11-06-2000).]
"Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge.