Reversal film

Common card · No. 287132

In photography, the terms reversal film, slide film, positive film, and transparency film describe a type of photographic film that produces a positive image on a transparent film base. In place of negatives and printed photographs, reversal film produces diapositive photographs, known as diafilm and dia images. A diapositive slide is a mounted frame of transparency film intended for large-format projection of the image onto a screen by a slide projector. Such large-format projection permits many spectators to view the diapositive image at one time. The usual transparency-film format is the 35 mm slide, wherein one frame of film is mounted into a 2 in. ×2 in. square made either of cardboard or of a plastic material. Reversal film is produced in format sizes that range from 35 mm to roll film to 8 in. ×10 in. sheet film. Moreover, specialized photographic processing laboratories produce diapositive slides from digital-camera images in formats such as the JPEG, from computer-generated presentation...

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