This technique is also referred to as colour keying, colour-separation overlay or by various terms for specific colour-related variants such as green screen, blue screen and magic pink. Chroma keying can be done with backgrounds of any colour that are uniform and distinct, but green and blue backgrounds are more commonly used because they differ most distinctly in hue from human skin colours. No part of the subject being filmed or photographed may duplicate the colour used as the backing. We have one in the studio ! Up to you to fill it in.
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