Keying
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Contents |
Definition
Keying refers to pulling a 'key' from of an object or people filmed against a brightly light green/blue background, or green/blue screen. In After Effects you can key footage with 'Keylight' by The Foundry. Other compositing software can pull keys, such as Shake, Final Cut and Photoshop (for still images only). The aim of keying is to produce a greyscale matte to mask or hide the green background. It is then possible to composite the keyed footage into new backgrounds, or combine it with other imagery/footage. Actors for feature films, music videos and interviews are often shot against a green screen, when compositing or visual effects are needed.
Techniques
An evenly light green screen will help create the best keys.
Books
Examples
Actors in a green screen set for the Thunderbirds film.
Example of a green screen footage and the resulting keyed Matte using Keylight and After Effects.
Example of a green screen footage composited using Shake with other elements in the film King Kong
