Definition of blue screen in English:

blue screen

Line breaks: blue screen
(also green screen)

noun

[often as modifier]
  • (In film and video techniques such as chromakey) a blue (or green) background in front of which moving subjects are filmed and which allows a separately filmed background to be added to the final image: a blue-screen effect
    More example sentences
    • There's also some truly heinous use of blue screen.
    • There you see her in front of the green screen.
    • An actor stands in front of a green or blue screen.

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