John Noakes demonstrates some of the mind-boggling visual effects that have been made possible using the Colour-Separation Overlay (CSO) technique. Only the BBC calls it Colour Separation Overlay, by ...

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, or green screen, ...