Bluescreen

Bluescreen is the film technique of shooting foreground action against a blue (or sometimes green, in which case the term is 'greenscreen') background, which is then replaced by a separately shot 'background plate' scene by either [optical effects]? or digital compositing.

[Petro Vlahos]? was awarded an Academy Award for his development of bluescreen techniques. His technique exploits the fact that most objects in real-world scenes have a colour whose blue colour component is similar in intensity to their green colour component.

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"Bluescreen" can also refer to an error message of Microsoft Windows operating systems, generally called the Blue Screen of Death.