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During development, the exposed silver salts are converted to metallic silver, just as with black-and-white film. But in a color film, the by-products of the development reaction simultaneously combine with chemicals known as color couplers that are included either in the film itself or in the developer solution to form colored dyes.
A peculiar advantage of the process was that skilled dye transfer retouchers would use the same dyes the image was printed with to fill in blank white spaces between two or three separate colour photographs such as a background shot (rocks and a waterfall) one or more human figures, and more often than not a product shot (a cigarette pack) to ...
A film base is a transparent substrate which acts as a support medium for the photosensitive emulsion that lies atop it. Despite the numerous layers and coatings associated with the emulsion layer, the base generally accounts for the vast majority of the thickness of any given film stock.
Two frames of a vertical filmstrip take up roughly the same amount of space as a single frame on the horizontal. Including its guard band, a vertical filmstrip could contain up to 64 images, while a horizontal oriented strip usually contained 32 images. This is based on the equivalent of a 25 exposure length of 35mm still camera film.
Closeup of the color filter layer (réseau) embedded in the base of a Dufaycolor transparency. A very thin coating of collodion on one side of the film base was dyed blue, printed with closely spaced fine lines using a water-repelling greasy ink, and bleached. The clear spaces created were then dyed green.
Plastic film is a thin continuous polymeric material. Thicker plastic material is often called a "sheet". Thicker plastic material is often called a "sheet". These thin plastic membranes are used to separate areas or volumes, to hold items, to act as barriers, or as printable surfaces.
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As a bipack color process, the photographer loaded a standard camera with two film stocks: an orthochromatic strip dyed orange-red and a panchromatic strip behind it. The orthochromatic film stock recorded only blue and green, and its orange-red dye (analogous to a Wratten 23-A filter) filtered out everything but orange and red light to the panchromatic film stock.