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Skleněné varhany (Stěklanna je garmonika, Andrej Chržanovskij, USSR 1968). Credit: Národní filmový archiv / National Film Archive, Prague. Photograph by Barbara Flueckiger
During the capturing of the film a beam-splitter in combination with filters in the camera divided the incoming light into a red and a green separation negative on black-and-white stock. When projected in the cinema the two images were combined simultaneously by additive mixture through corresponding red and green filters into one picture consisting of red and green colored light. The reduction of the whole color range to two colors (and their additive combinations) was necessary because of the complex optical arrangement.
The first subtractive 2 color process introduced by Technicolor captured the incoming light through a beam splitter with red and green filters also. However, in contrast to the first Technicolor process, the two b/w images were recorded on one negative strip. This was achieved by the pull-down of two frames simultaneously, a process that required the double speed in the camera. These two frames were arranged in pairs, whereby the green record was inverted up-side down (see image).
Skleněné varhany (Stěklanna je garmonika, Andrej Chržanovskij, USSR 1968). Credit: Národní filmový archiv / National Film Archive, Prague. Photograph by Barbara Flueckiger
Magnification 20x. Credit: photomicrograph by Silvana Konermann. Source: Eggert, John (1932): Kurzer Überblick über den Stand der Farbenkinematographie. Bericht über den VIII. Internationalen Kongress für wissenschaftliche und angewandte Photographie, Dresden 1931, pp. 214-222. Leipzig: J. A. Barth.
Knowing Men (GB 1930, Elinor Glyn), negative. Credit: Courtesy of BFI National Archive. Photograph by Barbara Flueckiger.
Technichrome, three-color print of bi-pack negatives, 1948. Credit: Gert Koshofer Collection. Sample No. 89. Photograph by Barbara Flueckiger
The beam-splitter prism. Source: Coote, Jack H. (1993): The Illustrated History of Colour Photography. Surbiton, Surrey: Fountain Press.
The Phantom of the Opera (USA 1925, Rupert Julian). Credit: UCLA Film & Television Archive. Photographs of the nitrate print by Barbara Flueckiger.