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Trucolor films were shot in bipack, with the two strips of film being sensitized to red and blue. Both negatives were processed on duplitized film, much like Trucolor's rival process Cinecolor. Unlike Cinecolor, however, the film was not dyed with a toner but a color coupler, similar to Eastmancolor film. Because of this chemical composition ...
In bipack color photography for motion pictures, two strips of black-and-white 35 mm film, running through the camera emulsion to emulsion, are used to record two regions of the color spectrum, for the purpose of ultimately printing the images, in complementary colors, superimposed on one strip of film.
Technicolor's three-color process became known and celebrated for its highly saturated color, and was initially most commonly used for filming musicals such as The Wizard of Oz (1939), Down Argentine Way (1940), and Meet Me in St. Louis (1944), costume pictures such as The Adventures of Robin Hood (1938) and Gone with the Wind (1939), the film ...
As a bipack color process, the photographer loaded a standard camera with two film stocks: an orthochromatic strip dyed orange-red and a panchromatic strip behind it. The orthochromatic film stock recorded only blue and green, and its orange-red dye (analogous to a Wratten 23-A filter) filtered out everything but orange and red light to the panchromatic film stock.
Experiments with color films were made as early as the late 19th century, but practical color film was not commercially viable until 1908, and for amateur use when Kodak introduced Kodachrome for 16 mm in 1935 and 8 mm in 1936. Commercially successful color processes used special cameras loaded with black-and-white separation stocks rather than ...
The most famous version of Technicolor, the full-color three-strip Technicolor Process 4 used from 1932 to 1955, exposed two of the three strips—the blue and red images—in bipack. The green record, the highest definition record, was exposed directly.
This bipack color system used two strips of film running through the camera, one recording red, and one recording blue-green light. With the black-and-white negatives being printed onto duplitized film, the color images were then toned red and blue, effectively creating a subtractive color print.
The first full-color animations were photographed using three-strip cameras. From 1934, animations were filmed using modified black and white cameras taking successive exposures through three color filters on a single panchromatic film, being simpler to operate and far less expensive. The technique lasted until 1973 (Robin Hood, Disney).