Hi

Since color in television camera have always used RGB (red, green & blue) light to produce color pictures, an effects generator is used to separate out a single color (presently green is used most often) and fill it with another picture source. This process is called Chroma Key. Since blue and green are technically the colors that are farthest from skin tone it is fairly simple to have the weather person to wear clothing that do not have the screen color allowing the Keyer to "cut out" the subject and insert the background image in the green area. Originally blue was used as the background color, but was changed to green as the technology evolved.


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Edited by Russell A on 10/6/2010 at 2:39 PM EST

Technically, just the opposite. The image of the weatherman is super imposed on the image from another source ( like another camera, video tape or a map generator) the green is electronically rendered invisible.

No, there is no image projected onto the green screen. The weatherperson is looking at monitors mounted in a pedestal that are positioned at the far ends of the screen, that is why they have to practice pointing to areas when there is really nothing there.

Take a look at this video and the others on the page for a full explanation. I have used these to quickly train some technicians.

http://www.youtube.com/watch?v=w6brdwY-dvU


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