Abstract
A simple model is presented that successfully predicts photographic response (characteristic) curves, using only experimental parameters. The model is based on the Gurney-Mott theory of latent image formation. For the first time the details of development, as well as of exposure, are explicitly taken into account. It is shown that real photographic systems are based on a compromise between choosing developers active enough to reveal very small latent images, and yet not active enough to spontaneously reduce (fog) crystals not bearing a latent image. The effects of chemical sensitization can readily be incorporated in the model : it is shown that experimentally observed results with pure silver halides cannot be explained simply by the presence of sensitizing atom clusters onto which photolytic silver nucleates, but that the quantum yield of photolysis is increased.
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