How to measure gain? - AVS Forum
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post #1 of 4 Old 01-15-2002, 05:51 AM - Thread Starter
 
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Normally the concept of unity gain would mean 100% of the light hitting the screen is reflected, and thus no measurement could be >1..

But in the HT world it seems unity gain is defined as the amount of light reflected by a matte white screen. (which white?) And what effect does a gloss sheen have on gain?

And how can a screen have a gain of 4?! Is it coated with triangular street reflectors?

Is there an objective way to measure gain?

OT: Is Video Essentials the best way to tweak a system? Does it require a light meter? Is there a better way to get color balance?
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post #2 of 4 Old 01-15-2002, 06:34 AM
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http://www.dalite.com/educational_ma...ils&issueid=48
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post #3 of 4 Old 01-15-2002, 11:00 AM
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And this is exactly why gain should be re-labelled directivity. This would be in agreement with conceptually similar phenomena in acoustics, antennae etc. Unfortunately, gain seems to be an established term that is hard to get rid of.
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post #4 of 4 Old 01-16-2002, 06:46 AM - Thread Starter
 
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Thank you both.
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