I personally think that a Gain >1 and gray screen is absoulte nonsense.
What do you want? Gain > 1 or gain
Gain=1 is a plain white wall, for gain > 1 you have to make some coating, for gain
so the only reason for building such a screen woul be: You like the hotspotting and reduced viewing angle effect but not the gain you will get.
The Greyhawk does just what you guys are saying. There are real benefits to it as well. There are two way to get an effective 1.0 gain screen. Either have a screen that is painted white with a flat surface coating or have a screen that is grey .8 and then put a glossy coating on it to bring it back to 1.0 (this is similar to what the greyhawk does)
The benefits all come down to room interaction. If you were projecting in outerspace or in black room that had no lights, there would be no difference between a "flat" 1.0 screen and a "glossy" 1.0 screen other than a very mild hot-spot that the glossy screen would have. That's the disadvantage.
The advantages are when a non-ideal room is used:
1. The glossy screen can help divert any light that is hitting the screen to the other side of the screen instead of saturating the screen.
2. The gloss also improves ANSI-type contrast ratios even if there are no lights on. This is a little difficult to explain but if the room is small relative to the screen and or has a light color to it, the overall grey nature of the screen will help reduce the impact of reaborbed light from the image that is being projected. To say it differently, the bright areas of the image illuminated the room. The room then emitts some of this light back to the screen which will effect the dark regions of the image. The gray screen helps this process.
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