CHICAGO (CBS) -- Many donned green apparel Friday in celebration of an early St. Patrick's Day – but in the TV news industry, wearing green has some longstanding pitfalls. Chroma key ...

This is a technology TV and film studios have used for decades ... and [Corridor Crew] have rebuilt it. Green screens, or chroma key, to give the effect its real name, relies on the background ...

(2) Also called "chroma key," it is a technique for superimposing one video image onto another. Widely used to place an interesting scene behind people such as a news reporter on TV, it is also ...

The technique is also known as chroma key compositing, and it’s generally used to merge two images or videos together based on color hues. Usually you see an actor filmed in front of a green ...