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What is Green Screen?

Chroma key compositing (or chroma keying) is a technique for compositing two images or frames together in which a colour (or a small colour range) from one image is removed (or made transparent), revealing another image behind it. This technique is also referred to as colour keying, colour-separation overlay (CSO), green screen, and blue screen. It is commonly used for TV broadcasts, wherein the presenter appears to be standing in front of a large map, but in the studio it is actually a large blue or green background. The meteorologist stands in front of a blue screen, and then different weather maps are added on those parts in the image where the colour is blue. If the meteorologist himself wears blue clothes, his clothes will become replaced with the background video. This also works for green screens, since blue and green are considered the colours least like skin tone. This technique is also used in the entertainment industry, and professional photography studios alike, just like Spring Lake Studios.

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