THE IMPACT OF THE GRAIN-SIZE AND SPATIAL-DISTRIBUTION OF DEVELOPED SILVER ON RMS-GRANULARITY OF SINGLE-LAYER COLOR NEGATIVE FILMS

A model which permits the calculation of RMS-granularity from primary layer and coupler data was applied to single layer colour negative coa tings containing a polydisperse tabular grain emulsion in combination with various couplers. Calculated and measured data were analyzed with respect to dye yield, dye extinction, the characteristic curve and th e RMS-granularity-density curve. A comparison of theory and experiment shows that the non-random, i.e. move orderly spatial distribution of the developed silver specks, and the smaller degree of size polydisper sity of the silver grains compared with the original silver halide emu lsion can significantly reduce RMS-granularity for mid- and upper scal e exposures.