Kinetic models for the development of density in photographic and radiographic film

What is it about?

The behaviour of radiographic and photographic films is usually described in terms of a plot of optical density against log (exposure). This form, based on a desired 'ideal' rather than any theory of the actual process, leads to great difficulties of interpretation and arbitrary 'speed' determinations. It is shown that much simpler models offer much better good explanations. A rational speed parameter and a contrast index are proposed.

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Why is it important?

The characteristics of silver halide films are much more easily studied with rational models.