Abstract
AbstractAn outline is given of the mechanisms underlying the basic photographic characteristic curve, that is the plot ofdensity vs thelogarithm ofexposure, an introduction to the idea of symmetry as it relates to such curves, and a discussion of the reasons for the departure from strict symmetry exhibited by practical photographic systems. An account is also given of the mathematical expression of these considerations, initially for the case of symmetrical curves in terms of so-called functional equations and then more generally for asymmetrical cases, including the derivation of the appropriate parameters for process control purposes. As an aid to actual curve fitting, some of the properties of the asymmetrical curve are also derived. Finally, an account is given of some further generalizations to the basic photographic functional equation which alloivs some consideration of multilayer modelling.
Published Version
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