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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...


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