How Green Screen Compositing Worked Back in the Days of Film

Before the days of digital magic, people had to rely on clever film techniques and chemical processes for “green screen” (or chroma key) compositing. Tom Scott created the short video above that provides a quick overview of the techniques that were used.

If you find this subject interesting, here’s a second video that goes more in depth into the innovative camera film tricks that people came up with to composite moving images:

These videos are focused on the world of filmmaking, but many of the ideas and techniques discussed were used through the history of photography as well.

(via Reddit)