low-intensity reciprocity failure

low-intensity reciprocity failure

[′lō in‚ten·səd·ē ‚res·ə′präs·əd·ē ‚fāl·yər]
(graphic arts)
The loss of sensitivity of a photographic plate at low light levels and long exposure times, so that the exposing intensity required to produce a given photographic density is no longer proportional to the reciprocal of the exposure time.
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