UNDEREXPOSE
underexpose
(verb) expose insufficiently; “The child was underexposed to language”
underexpose
(verb) expose to too little light; “The film is underexposed, so the image is very dark”
Source: WordNet® 3.1
Etymology
Verb
underexpose (third-person singular simple present underexposes, present participle underexposing, simple past and past participle underexposed)
(photography) To take a photograph using too small an exposure
To provide with insufficient publicity
Adjective
underexpose (comparative more underexpose, superlative most underexpose)
(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.
Source: Wiktionary