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At the present time, the greater number of processes of color cinematography upon which work is being done, and by which the film is being made for the market are two-color subtractive processes, and in most of them the two images are on opposite sides of doublecoated film.
Kinemacolor Projecting Machine
In this, the dyeing depends upon the bleaching of the silver by means of a bleaching bath which hardens the gelatine in the presence of silver and thus enables the silver negative to be transformed directly into a dyed positive, since an acid dye dyes the soft gelatine preferentially and so dyed most strongly the gelatine where the least silver was present.
Gaumont. The most complete and satisfactory process of color cinematography is undoubtedly the simultaneous three-color additive process worked out in its complete form by Gaumont. Three lenses are used in the camera and three pictures are taken through the primary color filters upon the same strip of film. A normal motion picture is 1 inch wide by % inch high and corresponds to four sprocket holes in the film. The Gaumont pictures are three sprocket holes instead of four for each color, so that the whole set of color pictures corresponds to nine sprocket holes, and the film is two and a quarter times the length of the standard film (Fig. 17). After each exposure, the film is pulled down, therefore, the length of nine sprocket holes at one time, and a new set of pictures is taken, sixteen pictures a second being exposed j ust as normal pictures . The positives are proj ected in a
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