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Posted by Larry in AZ on 04/17/07 22:20
Waiving the right to remain silent, "GeekBoy" <ner@nerdy.com> said:
> "EHSTC" <pilkington13@netzero.net> wrote in message
> news:1176843245.443261.165350@p77g2000hsh.googlegroups.com...
>> Hey all,
>>
>> My high school TV studio has a green screen, and we have got it to
>> work, but I get loads of "sparkles" on my subject. Ive looked into
>> this online, and found that it is cuz of spill from over lighting at
>> that the screen luminisity or something should be at 40-50
>> IRE........WHAT IS IRE, and how do i measure that?
>>
>
>
> Institute of Radio Engineers; IREs are units of measurement dividing the
> area from the bottom of sync to peak white level into 140 equal units.
> 140 IRE = 1VP-P
>
> Using a vector or wave scope which is a lot more money than maybe the
> school is willing to spend. Unless they arelready have a scope.
> Some editing software has these on them to measure.
Or, make the lighting on the green screen about half that on the talent.
Amounts to about the same thing, or close enough...
--
Larry Jandro
Video Engineering & Equipment Rentals
Scottsdale, Arizona, USA
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