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589Final Cut Pro User Guide
Keying, masking, and compositing
Keying
Intro to keying in Final Cut Pro
Keying is creating areas of transparency based on color or lightness values in an image.
Keying is commonly performed on subjects photographed against a blue or green
background, but keys can be based on any color (color or chroma keying), or on a specific
range of lightness values (luma keying).
Keying allows you to composite (combine) a foreground clip and a background clip into
one video image. The foreground clip is processed to key out (remove) either a color or
a lightness value in areas of the image, allowing the background clip to show through in
those areas.
For example, you can take a video clip of a person standing in front of a green-screen
background and replace the green with an interior scene, making it appear as though that
person is standing in the room.