Why do we use green screens?

Question

I don’t understand why we can’t have red screens or black screens.

It’s just green for some reason.

In: Technology

Answer 1

The technology is called chroma keying. With it, you can select a color and video software will select that color (you can choose the tolerance) and delete those pixels. So the color doesn’t need to be green. We also have blue screens. Whether one should use blue or green screen depends on the lighting of the subject and the scene that will replace the original.

We choose between blue and green screens because those are the colors that are not present in human skin. Anything with red or orange would easily spill over the skin and delete parts of the subject in front of the screen.