Definition - What does Chroma Key mean?
Chroma keying is a technique used for combining two frames or images by replacing a color or a color range in one frame with that from the another frame.
It is often used in film industry to replace a scene's background by using a blue or green screen as the initial background and placing the actor in the foreground. The principle behind chroma keying is that the color blue is the opposite color of skin tone, so a distinction between the two is very clear, making it easier to select the color without worrying about any part of the actor being included in the selection. The whole blue selection is then replaced with another frame as the background.
Chroma key is also known as color keying and color separation overlay; it is also commonly called blue screen or green screen.
Explains Chroma Key
chroma keying is used in newsrooms and streaming video a live or recorder production tv program to replace a blue or green background with computer virtual set studio design or footge video background .
The chroma key process is widely used because it is cheaper to do this than to design real studio or inaccessible locations. It can also be done in real time,