Chroma key (commonly called green screen) is a post-production technique that replaces a solid-colour background in filmed footage with a different image or video.
Why it matters#
Chroma key gives a production team control over the presenter’s visual environment without requiring a physical set. The presenter is filmed in front of a green (or blue) screen, and the background is replaced in editing with any image, graphic, or video. This is useful when a physical location is unavailable, inconsistent, or unsuitable for the content.