In such popular 21st century films such as: The Avengers and Harry Potter, the technique known as Chroma-Keying or 'Green-screening' is essential when creating big animations, backgrounds or even large charaters such as Stan Lee's 'The Hulk.' Green Screening allows the filming to be taken in a room and then when shown to an audience, the backdrop can be anything from under the sea, to the deepest parts of space.
Earlier forms of Chroma-keying used a white screen rather than a green or blue one. It did work to some degree however there was a white glow around actors and items. Here is an example of the glow:
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