Keying
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Keying is the process of taking a certain aspect of a video and "keying it out" (removing) it from the footage. Usually this is done to create transparent segments of the video of which other layers can be placed underneath.
The most common usage of this is the "green screen", where the color green (or blue) will be made transparent. This is commonly done in movies by having a green room the actors will work in; then the background is edited in. Just like in movies, this idea is applied to Tennis to either remove aspects of a video, or (when working with editors that cannot support alpha channels) key out backgrounds for puzzle pieces to be used properly.
Keying Types
Chroma Key
Most commonly used by professional editors.