Chroma key compositing
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Chroma key compositing is the process of isolating and removing a particular colour value from a digital still or video image, and replacing it with a background plate.
The subject is filmed in front of a monochromatic screen (usually green, hence the familiar term ‘green screen’), which is then removed and replaced with the chosen background.
Any colour screen can be used for chroma key compositing but blue and green are the main choices as they are absent from skin tone. There are many pros and cons for each. For example, blue is more forgiving regarding ‘spill’ but green is more friendly for lighting purposes.
Most of the success or failure for chroma keying is determined during the shooting stage; evenly distributed lighting, absence of shadow, camera and codec choices are just a few important considerations.