By using high-contrast black-and-white film to create the mattes, you can create the silhouettes. These mattes are easy to create because the bright blue color, when run through a red filter, turns black. One shows the actress's silhouette in black, and the other is the reverse, like this: In the special effects department you can easily use special filters to form two mattes from the shot of the actress. You end up with two pieces of film that look like this:įilm of the river gorge, known as a "plate" Behind the actress in the studio you place a bright blue background screen (hence the name "blue screen"). You then film the actress dangling from a rope 2 feet off the ground in a studio. This shot is called the background plate. To use the blue screen technique, you first film the river gorge on location. Perhaps the clouds are filmed with a slow film speed, so that when played at normal speed they look like they are boiling across the sky. Then, the camera operator rewinds the film in the camera, puts a piece of black paper on the lens to mask out the portion of the film already exposed, and films the clouds of a thunderstorm. The scene is shot normally, but in the camera the film is exposed on only one half of the frame. When this shot is created, however, a piece of black paper or tape is used on the lens so that the area of the sky is masked out and left unexposed on the film. To create this effect, the cameraman can first shoot the actors on the plain. Let's say that the director would like to create a spooky scene where the actors are walking across a large, flat plain while the sky boils with dark clouds. A very common effect can be easily created using a double-exposure matte. Mattes have been used in the film industry practically forever to create special effects. The original scene: Actors on a plain on a nice day Not very spooky.
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