You film something or someone in front of a colored background - the green screen - then you replace everything that’s in the color of the screen with other footage, images, charts, presentations, or whatever visuals you want.Ĭhroma keying a live stream works almost the same way. You probably already have an idea of how to use a green screen, at least in principle. It doesn’t have to be green at all, though, and the technical term for it is “chroma keying.” What does the weather forecast on your local TV station have in common with a $300 million blockbuster? They both use the same visual effect: a green screen.
