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Bluescreen is the film technique of shooting foreground action against an even-lighted blue background, which is then replaced by a separately shot "background plate" scene by optical composition .

Other colours are sometimes used instead of blue, including green ("greenscreen"), orange, or grey. The choice of colour depends on the subject. Blue is normally used for people because human skin has very little blue colour to it. The same is also true for green, so the director can choose which colour to use depending on makeup and costume. Orange screens are often used with model photography where the model contains both blue and green components. Grey screens are beginning to be used in television for digital compositing. The grey colour is a very precise shade that a computer can pick up, allowing the subject to wear any costume or makeup.

The television technique of chroma keying was originally developed as an inferior imitation of bluescreen. With modern digital compositing techniques, the two analog techniques have converged.

The bluescreen technique is used in moviemaking to combine footage of actors, objects and backgrounds that were shot separately. The background footage can be wholly or partially created using computer-generated imagery (CGI). In early 2000s several movies were made, including Immortel: Ad Vitam , Sky Captain and the World of Tomorrow and Casshern that combined real actors shot against bluescreen with all-CGI backgrounds. Often actors played each scene separately to give the director greater freedom. Towards the end of 2004, Drew Carey hosted a TV show where comedians act against a greenscreen background with live audience interaction. After post-production, viewers watching the show would see animation interlaced with the live acting.