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so that they exactly register one on top of the other on opposite sides of the film. The emulsions being exactly the same and the light intensities the same, there is no difficulty in obtaining equal results in the two pictures, and the strip is then developed and fixed for the two pictures, and without further delay is passed into the bleach bath, which bleaches the silver and locally hardens the gelatine
Fig. 20. Two-Color Projection Printer
where the silver was present. The silver is then fixed out, leaving a clear coated gelatine strip of film bearing the images in the form of hardened gelatine on both sides. The two sides are then dyed by passing through a dyeing machine, the side containing the pictures taken through the red filter being dyed blue-green and that through the green filter, red. On viewing the film so prepared, a two-color subtractive picture is seen, which, being on standard film, can be run in any machine in the same way as black and white.
Factors in Color Cinematography. In considering processes for cinematographic work the following points must be dealt with: (1) Exposure necessary. (2) Quality in the negative. (3) The handling necessary for the production of the positive. (4) The type of projection machine required. (5) The amount of current required for light. (6) Definition. (7) The color rendering obtained.
1. Exposure Necessary. In the additive processes the most advantageous position is held by the Gaumont process because in this process the pictures are taken at normal speed, the filters can be
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