What is Optical printer?
<!-- Image description needs simplifying --> [[File:Opticalprinter.jpg|thumb|300px|An optical printer with two projector heads, used in producing movie special effects. Starting from the left, you can see light shining from the lamp house, then at A is the first projector's film gate, at B a lens that projects the film in A onto the second projector's gate C. At D is the lens of the camera, the camera's finder is at E and the adjustable shutter control at F. In the heavy base G all the electronics needed for controlling the printer are located.]] An '''optical printer''' is a machine. It can be used to copy rolls of [[movie]]s. It is made of one or more movie [[Movie projector|projectors]], which are linked to a movie camera. It allows [[filmmaker]]s to re-[[photograph]] one or more strips of movie. The optical printer is used for making [[special effects]] for motion pictures or for copying and restoring old movie material. Common [[optical effect]]s include fade outs and fade ins, dissolves, slow motion, fast motion, and [[matte (filmmaking)|matte]] work. More complicated work needs dozens of elements, all combined into a single scene. Ideally, the audience in a theater should not be able to notice any optical printer work, but this is not always the case. For economical reasons, especially in the 1950s, and later in TV series produced on movie, printer work was limited to only the actual parts of a scene needing the effect, so there is a clear change in the image quality when the transition occurs. The first, simple optical printers were constructed in the early 1920s. [[Linwood G. Dunn]] developed the idea in the 1930s. The development continued well into the 1980s, when the printers were controlled with [[minicomputer]]s. Since the late 1980s, [[digital]] compositing began to replace optical effects. Since the mid nineties the conversion to digital effects has been almost total. Optical printing today is used most widely by artists working exclusively with movie. As a technique, it proves particularly us