Rotoscoping

Rotoscoping is an animation technique that animators use to trace over motion picture footage, frame by frame, to produce realistic action. Originally, live-action film images were projected onto a glass panel and traced onto paper. This projection equipment is referred to as a rotoscope, developed by Polish-American animator Max Fleischer. This device was eventually replaced by computers, but the process is still called rotoscoping.

In the visual effects industry, rotoscoping refers to the technique of manually creating a matte for an element on a live-action plate so it may be composited over another background.

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