Chromogenic
Chromogenic refers to photographic processes that work by forming a conventional silver image and then replacing it with a dye image. Most films and papers used for color photography today are chromogenic.
Description
Chromogenic film or paper contains one or many layers of silver halide emulsion, along with dye couplers that, in combination with processing chemistry, form visible dyes. In processing, the silver image of each layer is first developed. In concert with the dye couplers in each layer, the process subsequently forms dyes only in those areas where silver is present.
In full-color chromogenic materials, multiple layers of emulsion are sensitized to different wavelengths of light. Three layers are usually present, generally sensitive to red, green, and blue colored light. Cyan-colored dye is formed on the red-sensitive layer, magenta-colored dye is formed on the green-sensitive layer, and yellow-colored dye is formed on the blue-sensitive layer, following generally the CMY color model.