• I believe there are two reasons for this. The first, which is science based, is that there is no shade of blue in human skin tones. This is why they shoot scenes that will have computer graphics added in with a blue-screen. It just makes things that much easier. The second, which is PURELY A PERSONAL HYPOTHESIS, is that the human mind is used to seeing things with the sky as the background. A blue background just gets imbedded in your brain as a default background. It seems natural to use it more than any other color. That's just pure speculation though.
  • Both blue and green are used for, what is called in video, colour-key substitution. A strong and clearly identifiable colour is selected for backgrounds or inserts that are later replaced electronically by another image during production. The selected colour is not one that is usually encountered during filming or one that can easily be avoided. A similar process is used in film. The performers or people being photographed do not wear (theoretically) any similar colours, so as to avoid problems during editing. Originally a shade of bright blue was used, but most recent productions I have seen have used bright green instead. I recall the occasional news broadcast, where colours in the newsreader's tie were close enough to the colour-key that images could be seen in the tie during broadcast. All you can say is: whoops.

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