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Abstract
Colour film images are shown to have a granular structure. It differs from that of silver image films in that the grains are usually partially transparent, and vary mare in size, shape and distribution of transmission with distance. This difference in morphology complicates instrumental measurement of granularity, and can produce atypical granularity-density and granularity-magnification relationships. A grainless film with dye images is possible, at the sacrifice of sharpness. The colour aspect of the grains does not control visual graininess: the luminosity function is important. Because of this, magenta dye images contribute most to graininess, yellow images least.