How Green Screen Worked Before Computers

Writer
By Steve Higgins
February 04, 2015 6:37 PM ‐ YouTube
Tom Scott
For those of us who grew up in the age of CGI, green screen is just "a thing that computers do". But how did effects like this work before the age of pixels?

Tom Scott, with some suitably shiny graphics and a little help from Matt Gray put this quick summary together.

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