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Digital Compositing for Film and Video by Steve Wright

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CHAPTER 4

Despill

When an object is filmed in front of a greenscreen, green light from the brightly lit green backing screen contaminates the foreground object in a variety of ways. The edges of the foreground object are not perfectly sharp due to lens limitations, so the edges become blended with the green backing. There may also be semi-transparent elements, such as smoke or glass, and the ever-present wisps of hair. There can be shiny elements that reflect the green backing regardless of how much dulling spray is used. Then there is the ubiquitous flare and spill.

Flare is seen as a green “haze” that covers everything in the frame, including the foreground object you are trying to isolate from the green backing. It is caused by the flood ...

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