WHY are movies shot against a green background?

The green background is used in films in order to replace it with computer-generated visual effects: a single-color green canvas transforms into a panorama of the city, for instance, during the post-production phase.

Technically, the background color can be anything – gray, white, black or purple, but films are shot against a green background, as this color stands out the most (that is, it is easier to highlight and replace it with another color or image later on).

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