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Surpress color on bottom layer based on edges of top layer?
Here’s a screenshot of the issue:

In the main photo you can see around the edges there is some green bleeding through.
What we had were keying cards with tracking marks on them and I ultimately just pulled corner pin data from the tracks and laid footage on top of those.
But when I turn on motion blur for the top footage, the green from the key card shows through.
So, is there a way to surpress that green color based just on the overlaying footage since the boundaries of the footage are already set (vs. creating and tracking separate mattes)?