Abstract

The frequency response of a linear system is unique, whereas the response of a nonlinear system depends upon the wave form used to make the measurement. Characterizing the filtering properties of a photographic system by a single spatial frequency response curve is therefore valid only if the system is linear. It is shown that certain common emulsion-developer systems can be satisfactorily treated by linear methods; an example is also given of a system where such methods are inadequate. A simple model is introduced to aid in specifying the frequency response and transient or “edge” response of the photographic systems tested. Damping constants based upon this model are tabulated for several emulsion-developer combinations and limitations of the model are discussed.

© 1958 Optical Society of America

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