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Keeping Green in a Green Screen VFX shot?

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John Weber
Keeping Green in a Green Screen VFX shot?
on May 28, 2014 at 4:37:44 am

So I'm showing off some stuff on a green screen. Problem is, some of that stuff, namely some magazine covers, have some green and yellow in them that keeps getting keyed out. How can I keep the green in those items without hand-animating a mask? Is that even possible?

For the record, I'm using CS3 and my keyer is Keylight 1.2. Thanks for the help.


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Dorian Heller
Re: Keeping Green in a Green Screen VFX shot?
on May 28, 2014 at 5:24:40 am

I think a mask would be your be bet, probably...


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Todd Kopriva
Re: Keeping Green in a Green Screen VFX shot?
on May 28, 2014 at 5:57:57 am

Use a hold-out matte:
http://helpx.adobe.com/after-effects/using/keying.html#use_a_hold_out_matte

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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Dorian Heller
Re: Keeping Green in a Green Screen VFX shot?
on May 28, 2014 at 6:31:36 am

What would the difference between a Hold-Out matte and a mask?


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Dave LaRonde
Re: Keeping Green in a Green Screen VFX shot?
on May 28, 2014 at 4:09:44 pm

Not much, just a LOT simpler than rotoscoping, which could be what you might be alluding to. In principle the same thing.

The transparent areas of the key are made opaque -- very easy -- and to eliminate unwanted portions of opacity, you animate a garbage mask. Poof! A Hold Out Matte.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Kevin Camp
Re: Keeping Green in a Green Screen VFX shot?
on May 29, 2014 at 5:56:32 pm

Since you are using keylight, you can also try the 'inside mask' feature. Create a mask on your clip around the items you don't want to key. Set the mask mode to none. Then in the keylight inside mask setting select the mask.

Kevin Camp
Art Director
KCPQ, KZJO & KRCW


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