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Abstract
Following the Chasman approach to the granularity of colour negative systems it is possible to derive a simple expression for dye granularity at a given density or weight of developed silver per unit area. This expression involves the granularity and covering power of the silver image generated in colour development and the slope of the relation between dye density and weight of developed silver per unit area.
A variety of colour negative systems have been examined with the aim of confirming the significance of individual terms, the expression as a whole, and hence the general approach.
Support is found in the ability of the expression to predict satisfactorily variations in granularity maxima and locations of such maxima for variations in emulsion grain size, development time, and coating weights of image coupler and DIR coupler. However, there is some tendency for derived dye granularities to exceed those determined directly, for which no explanation has yet been established.