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Colour reproduction by photography

The subjective and objective terms necessary for discussing colour are explained, and the various possible aims for colour reproduction in pictures are discussed. The tone reproductions required for reflection prints and for displayed transparencies are described and their differences explained. The methods used for forming the cyan, magenta and yellow dye images in colour photography are described; the unwanted retinal stimulations and the unwanted absorptions of the dyes are shown to reduce the reproducible colour gamut. Factors affecting the granularity and sharpness of colour photographs are discussed, and the methods adopted for the mass-printing of amateurs' negatives are described. Systems of colour photography in which the picture is processed in the camera are briefly described.