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Abstract
A number of methods for specifying and predicting the performance of complete photographic systems are discussed, and advantages are claimed for the use of Cobb chart resolution as an overall figure of merit.
Fourier transform techniques are used to compute the Cobb resolution of a system from its modulation transfer function (expressed either analytically or numerically) and the granularity present, and methods are given for estimating the Cobb resolution of a complete sytem from those of its individual components, or from their modulation transfer functions or spread functions, when these are more readily available.
Results are presented in graphical form, for quick performance estimates, and as empirical formulae for use in system optimization.