Rotoscoping is an animation technique that animators use to trace over motion picture footage, frame by frame, to produce realistic action. ... In the visual effects industry, rotoscoping is the technique of manually creating a matte for an element on a live-action plate so it may be composited over another background.
Chroma keying is a technique used for combining two frames or images by replacing a color or a color range in one frame with that from the another frame.
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