The really short answer is that green screens are green because people are not green. In order for the effect to work, the background must use a colour that isn't used elsewhere in the shot – and green is nothing like human skin tone. ... And human skins reflect broadly similar ratios of each colour of the spectrum.

What is the benefit of a green screen?

Using a green screen allows the filmmaker to layer any background with the subject being filmed or photographed. The subject is filmed against the green (sometimes blue) background, which is replaced in post-production by a digitally generated background.

Why is green the best color for virtual background?

Bright green is used as the background since it's unlike any natural human skin tones, and it's unlikely someone would be wearing that color on their clothing. Using the same principle, Zoom recommends using a physical green screen for proper performance of the virtual background feature.