Green Screens Were Way More Clever Before Computers

By Chris Mills on at

In the digital age, it's pretty simple to understand how green screens work: anything of a certain colour in the image is replaced with the background. But green screens were around for decades before digital photography, and the old technology was impressively crafty.

As YouTube master-explainer Tom Scott explains in this video, there were two different techniques used: one for film technology, and a second for live TV productions (the origin of the first true green screens). [YouTube]