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Concept
Dufaycolor
Résumé
Dufaycolor is an early British additive colour photographic film process, introduced for motion picture use in 1932 and for still photography in 1935. It was derived from Louis Dufay's Dioptichrome plates, a glass-based product for colour still photography, introduced in France in 1909. Both Dioptichrome and Dufaycolor worked on the same principles as the Autochrome process, but achieved their results using a layer of tiny colour filter elements arrayed in a regular geometric pattern, unlike Autochrome's random array of coloured starch grains. The manufacture of Dufaycolor film ended in the late 1950s.
The photographic reproduction of natural colour by means of a black-and-white photograph taken and viewed through a mosaic of tiny colour filters was an idea first patented and published by Louis Ducos du Hauron in the late 1860s, but the incomplete colour sensitivity of contemporary photographic materials made it impractical at that time. John Joly independently reinvented the concept in 1894 and attempted to commercialise it, but the first successful product based on this idea, the Autochrome plate, did not reach the market until 1907. Several competing mosaic colour screen plate products soon appeared, including Louis Dufay's Dioptichrome plate, but the Autochrome plate remained by far the most popular and the production of Dioptichrome was ended in 1914. A film-based version of Autochrome was introduced in 1931, shortly before the first Dufaycolor product appeared.
These plate and film products differed substantially only in the means used to manufacture the colour mosaic layer and its resulting pattern and fineness. Autochrome's mosaic was a random array of dyed potato starch grains, too small to be individually visible without a microscope. Most competing products employed a coarser geometric pattern created by one of the many methods devised and patented during that era. Dufaycolor's filter layer was of the geometric type, but its proprietary manufacturing process produced an unusually fine-patterned mosaic.
Source officielle
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