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Chapter 14. Effects in Action > Using Chrominance-Based Keys

Using Chrominance-Based Keys

Chrominance-based keys use chrominance (color) to define the transparent areas of a clip. Chrominance-based keys are commonly used to composite moving subjects that were shot against a colored background, usually a blue or green backdrop called a bluescreen or greenscreen, respectively. Provided that the subject doesn't contain the key color, a chrominance-based key can remove the background while leaving the subject opaque.


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