Percent Gray - AVS Forum
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post #1 of 2 Old 10-19-2000, 08:44 AM - Thread Starter
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Hello all,

Can anyone describe the approximate percentile of gray that would be beneficial to a "grey" screen. I am currently contacting several manufacturers and would like to be able to give a percentage of gray for testing purposes.

For example, would a typical LCD projector benefit from a 16% grey while a typical DLP benefit from a 21% grey?

Would it be better to produce in 5% increments and have samples shipped to the home owner to evaluate the differences before purchases?

BTW, this is not going to be a business venture of my own - I am simply suggesting the idea to several companies that have a better turnaround for us want-it-now kinda folks... Additionally, these are not screen manufacturers, they make other products, so for now, I doubt you'll see any form of gain or glass beading going around.
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post #2 of 2 Old 10-19-2000, 07:25 PM
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My experimentation would indicate that reflected attentuation to about 700 lumens gives good results for matte screens for a 90" diagonal screen.

Hence 50% grey would work well with a 1400 lumen projector, whereas no attenuation should be used with a 700 lumen projector. Of course, this value should be scaled with the area of the screen.

i.e. %grey = (700/lumens) * (diagonal/90)^2

as a rule of thumb,
where 100% grey is white and 0% grey is black.
Note this is just an opinion.

Use a Kodak grey card for calibration.

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Ken Elliott

[This message has been edited by kelliot (edited 10-19-2000).]

Ken Elliott
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