Under the conditions of a low-altitude, rapid access photographic system, a method of simultaneously intensifying image exposures is compared to low intensity latensification. The simultaneous intensification resulted in a speed increase of 2.4 times, while latensification produced a speed increase of 1.7 times. Latensification was more effective in most of the other responses that were analyzed: reduction of Contrast Index was less by 0.1; speed at the minimum gradient point defined by the untreated strips was increased by latensification by 1.29 times compared to 1.23 times by simultaneous intensification. The detective quantum efficiency of the latensified film was higher than that produced by simultaneous intensification except for the extreme toe region where simultaneous intensification did increase information content. The maximum DQE found for the untreated film was maintained by latensification; the simultaneously intensified film showed a reduction of maximum DQE by 0.66. Because latensification permitted density increases with less loss of contrast, it was found to be the more effective treatment in terms of information, except in the extreme toe, leading to certain compromises. Simultaneous intensification may be suitable only for specialized applications in which use of an exposure in the extreme toe is required over optimum pictorial exposures.

Library of Congress Subject Headings

Aerial photography; Photography--Exposure

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Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Not Listed


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