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Dufaycolor
Dufaycolor is an early French and British additive color photographic film process for motion pictures and stills photography. It was based on a four-color screen photographic process invented in 1908 by Frenchman Louis Dufay. Dufaycolor worked on the same principles as the Autochrome process, but achieved its result using a slightly different method.
==How it worked==
The film base was dyed blue, printed with a mosaic using a resistive greasy ink and bleached. The resulting spaces were then dyed green. The process was repeated at an angle, the new spaces being bleached and dyed red, forming a mosaic of color filters consisting of a mesh of red, green and blue lines, at approximately one million color elements per square inch, known as a ''reseau''.
When exposed to light through the reseau, the film's emulsion was exposed to a single color of light. Thus the emulsion behind each color element recorded the tones for each primary color.〔(【引用サイトリンク】Glossary - Dufaycolor (matrix illustration) )〕
Upon projection, the reseau served to filter the white projected light, so that the colors of the photograph corresponded to those in the recorded scene; for example, red values were only shown in red. The same principle applied to green and blue components.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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