How Did Green Screen Work Before Computers? (Hint

February 5, 2015 6:55 PM

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“These days, green screen is easy,” says YouTuber Tom Scott in this fascinating video about the history of these visual effects. “You get your lighting right, you point a camera at someone, and then you click a few buttons and tweak a few settings in your graphics software, and there you go. Perfect.”

But how did these fancy effects -- created by the compositing of layers of images or videos -- work before the age of computers?

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