In photography, a reversal film is a type of photographic film that produces a positive image on a transparent base. The film is processed to produce transparencies or diapositives (abbreviated as diafilm in many countries) instead of negatives and prints. Reversal film is produced in various sizes, from 35 mm roll film to 8×10" sheet film.
A slide is a specially mounted individual transparency intended for projection onto a screen using a slide projector. This allows the photograph to be viewed by a large audience at once. The most common form is the 35 mm slide, with the image framed in a 2×2" cardboard or plastic mount. Some specialized labs produce slides from digital camera images in formats such as JPEG, and also work with computer-generated presentation graphics and make slides from images such as fingerprints, microscopic sections, paper documents, astronomical images, etc.
Reversal film is sometimes used as motion picture film, mostly in the 16 mm, Super 8 and 8 mm formats, to yield a positive image on the camera original. This avoids the expense and slight degradation of image quality resulting from using a negative film, and copying to a positive, to produce a print for projection.
Read more about Reversal Film: Film Types, Uses
Famous quotes containing the words reversal and/or film:
“Perversity depends on reversal and substitution.”
—Mason Cooley (b. 1927)
“The motion picture is like a picture of a lady in a half- piece bathing suit. If she wore a few more clothes, you might be intrigued. If she wore no clothes at all, you might be shocked. But the way it is, you are occupied with noticing that her knees are too bony and that her toenails are too large. The modern film tries too hard to be real. Its techniques of illusion are so perfect that it requires no contribution from the audience but a mouthful of popcorn.”
—Raymond Chandler (1888–1959)