I use a 600 lumen XGA LCD projector, the Mits X100.
What I want is a gray screen (improved perceived blacks), but with some additional *postive* gain, like 2.0-2.5-ish to improve the overall brightness on a 7-8 foot wide screen.
The gray screens discussed here, either home brew or commercial materials like the Grayhawk, seem to all be lower than 1.0 gain.
Does physics allow a > 2.0 gain gray screen that raises the foot lamberts overall, but still improves perceived black level through the gray color?
My thoughts were- what if Da Lite sprayed their normal glass beads used in their glass-beaded white screens (~2.5 gain) onto a gray colored backing material rather than the stock white material? Wouldn't this give a proper "gamma-corrected" surface for the reflected image? i.e. blacks should be perceived blacker, but mid and white tones should appear brighter due to the increased gain of the glass beads (?).
Essentially, what digital projector owners need is a screen material that reacts to the projected image light according to an optimal gamma-curve- i.e. for a light level at or below the black level light output of the projector, the screen reflects nothing. At mid and peak light levels, the screen material reflects an optimum ft-lambert light level, calibrated to ISF standards.
Of course, a material that could react in this fashion probably would cost more than the projector shooting images onto it http://www.avsforum.com/ubb/wink.gif
[This message has been edited by Rgb (edited 05-08-2001).]