Also using the additive principle and reversal processing were the Agfa color screen plates and films and Dufaycolor film, all of which were discontinued by 1961. Autochrome plates were discontinued in the 1930s, after the introduction of Lumière Filmcolor in sheet film and Lumicolor in roll film sizes. This was an additive method, using a panchromatic emulsion coated on a thin glass plate previously coated with a layer of dyed potato starch grains. The earliest practical and commercially successful color photography reversal process was the Lumière Autochrome, introduced in 1907. This avoids the expense of using negative film, which requires additional film and processing to create a positive film print for projection. Reversal film is sometimes used as motion picture film, mostly in the 16 mm, Super 8 and 8 mm "cine" formats, to yield a positive image on the camera original.
Some specialized labs produce photographic slides from digital camera images in formats such as JPEG, from computer-generated presentation graphics, and from a wide variety of physical source material such as fingerprints, microscopic sections, paper documents, astronomical images, etc. The most common form is the 35 mm slide, with the image framed in a 2×2 inch cardboard or plastic mount. This allows the photograph to be viewed by a large audience at once. Reversal film is produced in various sizes, from 35 mm to roll film to 8×10 inch sheet film.Ī slide is a specially mounted individual transparency intended for projection onto a screen using a slide projector. Instead of negatives and prints, reversal film is processed to produce transparencies or diapositives (abbreviated as "diafilm" or "dia" in some languages like German or Hungarian). In photography, reversal film or slide film is a type of photographic film that produces a positive image on a transparent base.
Type of photographic film that produces a positive image on a transparent base A single slide, showing a color transparency in a plastic frame Slide projector, showing the lens and a typical double slide carrier
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