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