ABSTRACT
When an object is fi lmed 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 refl ect the green backing, regardless of how much dulling spray is used. Then there is the ubiquitous fl are and spill.
