film
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motion-picture technologyFilmFilm types are usually described by their gauge, or approximate width. The 65-mm format is used chiefly for special effects and for special systems such as IMAX and Showscan. It was formerly used for original photography in conjunction with 70-mm release prints; now 70-mm…
Read MoreFilm types are usually described by their gauge, or approximate width. The 65-mm format is used chiefly for special effects and for special systems such as IMAX and Showscan. It was formerly used for original photography in conjunction with 70-mm release prints; now 70-mm…
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technology of photographyBlack-and-white filmsThe sensitive surface of ordinary film is a layer of gelatin carrying minute suspended silver halide crystals or grains (the emulsion)—typically silver bromide with some silver iodide. Exposure to light in a camera produces an invisible change yielding a
Read MoreThe sensitive surface of ordinary film is a layer of gelatin carrying minute suspended silver halide crystals or grains (the emulsion)—typically silver bromide with some silver iodide. Exposure to light in a camera produces an invisible change yielding a
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motion-picture camera…images on a reel of film that is repositioned after each exposure. Commonly, exposures are made at the rate of 24 or 30 frames per second on film that is either 8, 16, 35, or 70 mm in width.
Read More…images on a reel of film that is repositioned after each exposure. Commonly, exposures are made at the rate of 24 or 30 frames per second on film that is either 8, 16, 35, or 70 mm in width.
Read More- motion-picture technologyHistory
…first commercially successful celluloid photographic film in 1888, but it was too stiff for convenient use. By 1889 the George Eastman company had developed a roll film of celluloid coated with photographic emulsion for use in its Kodak still camera. This sturdy, flexible medium could transport a rapid succession of…
Read More…first commercially successful celluloid photographic film in 1888, but it was too stiff for convenient use. By 1889 the George Eastman company had developed a roll film of celluloid coated with photographic emulsion for use in its Kodak still camera. This sturdy, flexible medium could transport a rapid succession of…
Read More - spectroscopyX-ray detectors
…X-ray detector used was photographic film; it was found that silver halide crystallites would darken when exposed to X-ray radiation. Alkali halide crystals such as sodium iodide combined with about 0.1 percent thallium have been found to emit light when X-rays are absorbed in
Read More…X-ray detector used was photographic film; it was found that silver halide crystallites would darken when exposed to X-ray radiation. Alkali halide crystals such as sodium iodide combined with about 0.1 percent thallium have been found to emit light when X-rays are absorbed in
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radiation measurementFilm badge dosimetersThe density of the developed film can be compared with that of an identical film exposed to a known radiation dose. In this way, variations that result from differences in film properties or development procedures are canceled out. When used to monitor exposure to low-energy radiation such as X rays…
Read MoreThe density of the developed film can be compared with that of an identical film exposed to a known radiation dose. In this way, variations that result from differences in film properties or development procedures are canceled out. When used to monitor exposure to low-energy radiation such as X rays…
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radiologyDiagnosis…at first, and then double-coated photographic films; photographic emulsions have now been developed to such a point that high speed can be provided with good definition and little intrusion of photographic grain into the image. Similarly, processing methods have been improved; automatic processors now can deliver a fully processed dry…
Read More…at first, and then double-coated photographic films; photographic emulsions have now been developed to such a point that high speed can be provided with good definition and little intrusion of photographic grain into the image. Similarly, processing methods have been improved; automatic processors now can deliver a fully processed dry…
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- celluloid
…made into a clear, flexible film, which other researchers such as Henry Reichenbach of the Eastman Company (later Eastman Kodak Company) further processed into film for still photography and later for motion pictures. Despite its flammability and tendency to discolour and crack with age, celluloid was virtually unchallenged as the…
Read More…made into a clear, flexible film, which other researchers such as Henry Reichenbach of the Eastman Company (later Eastman Kodak Company) further processed into film for still photography and later for motion pictures. Despite its flammability and tendency to discolour and crack with age, celluloid was virtually unchallenged as the…
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nitrocelluloseChronology of development and use…that dried to a transparent film; mixtures of this composition eventually found use as collodion, employed through the 19th century as a photographic carrier and antiseptic wound sealant.
Read More…that dried to a transparent film; mixtures of this composition eventually found use as collodion, employed through the 19th century as a photographic carrier and antiseptic wound sealant.
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