Abstract
When long term storage is desired, photographic films are attractive storage media for electronic computers. Their storage capacity is limited primarily by granularity and turbidity of the emulsion and the spot size of a practical readout device. The relations between the element size and the number of resolvable density steps are derived as a function of the emulsion granularity and point-spread function and the light distribution in the scanning spot. Simplifications for special limiting cases of interest are derived and one such case is worked out numerically.
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