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Masking an Effect, not the layer (Chroma Key)

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Dan Powers
Masking an Effect, not the layer (Chroma Key)
on Dec 12, 2017 at 3:47:14 pm

So I need to mask a Chroma Key, it isnt typical where someone is in front of a green background. It is the opposite. A green square in the scene with people crossing, like the typical replace a computer screen with another shot. Masking the layer kills everything outside the mask, not just the key. Need to mask only the effect, but that isnt something I can find in AE.
I know a workaround is to layer the footage back on top and mask it to cover areas that need the effect masked, but using 8K red files, I am adding a lot more pixels to process. I would rather just mask the effect region...

Thoughts?


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Dave LaRonde
Re: Masking an Effect, not the layer (Chroma Key)
on Dec 12, 2017 at 5:31:19 pm

Do you have a screen shot you can show us? To clarify what needs to be done?

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


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Dan Powers
Re: Masking an Effect, not the layer (Chroma Key)
on Dec 12, 2017 at 9:50:12 pm

https://f1.creativecow.net/11957/an-inside-chroma-key#11958

Link to image


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Jarrick Harris
Re: Masking an Effect, not the layer (Chroma Key)
on Dec 12, 2017 at 10:04:19 pm

Hi, try this:
Apply keylight 1.2 to your footage layer
then, in the layer panel, twirl open Effects/keylight/compositing options and click the little + sign
it will then pop up a Mask Reference Point underneath - which you can chose to be the mask you drew.

I think that keylight should then just effect the mask


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Walter Soyka
Re: Masking an Effect, not the layer (Chroma Key)
on Dec 12, 2017 at 10:26:04 pm

This is called a Mask Reference. Here's the documentation and a quick tutorial:
https://helpx.adobe.com/after-effects/using/mask-reference.html

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Dan Powers
Re: Masking an Effect, not the layer (Chroma Key)
on Dec 13, 2017 at 7:04:38 pm

Many thanks guys!


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