underexpose

From under- +‎ expose.

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underexpose (third-person singular simple present underexposes, present participle underexposing, simple past and past participle underexposed)

1. (photography) To take a photograph using too small an exposure
2. To provide with insufficient publicity

underexpose (comparative more underexpose, superlative most underexpose)

1. (photography) The condition when a photograph is darker than it should be because the film was not exposed to sufficient light either because the camera aperture was too small or the duration of light was too short.