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Consequently there is appreciable colour degradation, even when only one set of dyes is involved as in a reversal process, if the original camera film is subsequently used as the projection positive.Degradation is considerably greater when a negative has to be printed on a positive material having dyes with similar characteristics, and worse still after passing through a duplicating stage.It is of interest to note that the colours of integral tripack negatives, as well as the densities, are reversed compared with the original scene.The coloured images in Eastman Colour Films are produced by a method known as dye-coupling development.“Multilayer” is descriptive not only of this particular group of films, but also those in which the layers may be separated after exposure, while “Monopack” is liable to be associated with a particular process which has been quite widely employed by Technicolor. (in German) Stokes, Melvyn (2009): Colour in American Cinema. In: Raphaëlle Costa de Beauregard (ed.): Cinéma et couleur. But if the multilayer is integral, and not meant to be separated, the images must be selectively coloured to allow for subsequent separation by colour analysis.“Integral Tripack” is therefore adopted as the most convenient term for describing the Eastman Colour Films. When the three separation records have been made, there are two basic methods whereby the scene can be reproduced in colour: additive and subtractive synthesis.The oxidized developing agent combines with the colour forming coupler to create a dye of appropriate colour, the concentration of which is proportional to the amount of silver in the image.

The separation positives form an intermediate link with the Colour Negative when making a Colour Internegative, so that their function is similar to that of a master positive in a black-and-white system. (ed.): The American Film Heritage, The American Film Institute. For this purpose, three positive images in dye or pigment form are prepared from the separation negatives, the red separation negative being printed in the red-absorbing or Cyan dye; the green negative in the green-absorbing Magenta dye; and the blue negative in the blue-absorbing Yellow dye.The silver image is removed at a later stage of the process.Three colour-forming couplers provide the appropriate dyes and are incorporated in the relevant emulsion layers.Integral tripack camera films have the advantage that they may be used in a standard black-and-white camera, and apart from a check on the colour correction and focus of the lens, no special precautions are necessary. The three images may then be superimposed on a single support to make the completed colour reproduction.It is of interest to note that the colours of integral tripack negatives, as well as the densities, are reversed compared with the original scene. In: Everett, Wendy (ed.): Questions of Colour in Cinema. The Eastman Colour Films are multilayer films of the type in which the layers are not separated after exposure.

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