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Posted by blackburst@aol.com on 04/18/07 13:12
On Apr 17, 7:03 pm, "nappy" <s...@spam.com> wrote:
> There isn't an absolute lighting value for Greenscreen.
>
> Make sure your greenscreen is lit well and evenly and most importantly move
> your talent far enough away to minimize spill.
>
> If you only have a small greenscreen then you have to play witht the light
> levels and the talent distance to minimize spill.
>
> "Larry in AZ" <usen...@DE.LETE.THISljvideo.com> wrote in messagenews:Xns99159C062189thefrogprince@69.28.173.184...
>
>
>
> > Waiving the right to remain silent, "GeekBoy" <n...@nerdy.com> said:
>
> >> "EHSTC" <pilkingto...@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
> > [Remove spamtrap in ALLCAPS to reply]- Hide quoted text -
>
> - Show quoted text -
There are two kinds of spill that screw-up greenscreen:
1) Talent shadows on the green background. Move them far enough out so
that shadows fall below the frame.
2) Green reflecting back onto the edges of your talent. Again, move
them as far out as possible, and back-light your talent to get a good
clip.
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