In the digital age , it ’s somewhat simple to understand how light-green projection screen ferment : anything of a certain colour in the image is replaced with the background . But greenish screen were around for decades before digital photography , and the old technology was impressively tricksy .
As YouTube schoolmaster - explainerTom Scottexplains in this video , there were two different technique used : one for motion picture technology , and a second for live TV production ( the origination of the first true dark-green screen ) . [ YouTube ]
Tom ScottYouTube
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