CompuServe Messages

Stated simply, chroma-keying is electronically "selecting" one color (narrow range of colors, actually), making that color "transparent", then placing the resulting image "over" another video signal. For example, a newsman sits before a large panel painted, say, blue. By chroma-keying, that blue panel goes "transparent", and news story footage from another source "shows through" the "window", such that you apparently see the footage over the anchor's shoulder. I'm explaining this poorly, I fear — Joanne could do much better — but you get the idea, perhaps. Rick