Adobe After Effects User Manual
Page 417
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Note:
3. On the duplicate layer, create masks to mask out everything in the image except the area that you want to preserve.
4. Make sure that the copy (the hold-out matte) is positioned directly on top of the keyed layer.
Don’t change Transform properties of only one of the layers after making the duplicate; keep the layers moving together. Consider
parenting one to the other. (See Parent and child layers.)
Adobe also recommends
Maintaining consistent color for background keying
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