preexposure

or pre-ex·po·sure

[pree-ik-spoh-zher]
noun
  1. exposure beforehand.
  2. Photography. the exposing of a film to even light, before photographing a subject, to increase its sensitivity.

Origin of preexposure

First recorded in 1935–40; pre- + exposure
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018