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It is a method in which images are projected on the front of the screen instead of behind it. In this type of set up, a half silvered mirror, which both transmits and reflects light, is placed at a 45 degree angle between the camera and the object in front of the process screen. The projector, which is positioned on the side (adjacent to the mirror) at a 90 degree angle to the camera, throws the background footage onto the reflective surface of the mirror, which in turn bounces that footage back onto the screen. For this to work, the process screen behind the actor or object must be made of a highly reflective material. Many front projection screens include millions of tiny glass beads. The actor or foreground character (or set) is situated in front of the screen behind the mirror. Additional studio lighting is obviously required to eliminate the part of the projected footage that is naturally reflected onto the actor. The main camera then films through the mirror and records both the actor and the reflected front projection.
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