The relationship between granularity and light-sensitivity of the colour photographic materials

The results of investigations of the relationship between the granularity a nd light-sensitivity of colour photographic materials, are presented. The r esults obtained are substantially different from known results for black-an d-white materials. The observed differences are due to quite other structur e of colour photographic materials. The photographic image of colour photog raphic materials is obtained indirectly, because silver halide crystals ser ve in this case as a radiation detectors only. The colour photographic imag e is obtained as a result of the heterogeneous chemical reaction between th e oxidation product of development substances and the dye coupler. The rela tive large difference of the size of silver halide crystals in comparison w ith the dye cloud causes that for the determined size of crystals of high s ensitive materials the relationship between the granularity and sensitivity is not observed. However the increase of sensitivity above the certain val ue, what is related to the silver halide crystal size, causes the proportio nal increase of the granularity. The results of experimental investigation of this problem are presented.