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In the olden days (1960s 70s and 80s, at least) they used to use a blue background for doing picture inlay of an actor into a remote background scene by switching between scenes as the scan moved over the picture. It was pretty crude at first but they eventually got the soft edges to look reasonable. News readers gradually lost their twittering edges against a background of Westminster.
Now, everyone uses a 'green screen' to achieve the same thing and it all works much better. Why did they change the 'switching' colour? The original argument behind the choice of blue was pretty convincing.
Now, everyone uses a 'green screen' to achieve the same thing and it all works much better. Why did they change the 'switching' colour? The original argument behind the choice of blue was pretty convincing.