Light shining from a source behind the object of interest or attention.
The backlight from the sunset cast the pier and the crowd in silhouette.
Egg candling uses backlight to look for chick embryos.
2
A spotlight that illuminates a photographic subject from behind.
3
Light that is behind a photographic subject.
If I do use backlight, it's not to separate the subject from the background; I use it to set a psychological mood, or to create a look.2006, Michael Grecco, Lighting and the Dramatic Portrait, Amphoto Books, →ISBN, page 73:
4
A light attached to an LCD display.
5
The rear window of a motor car.
backlight
verb
Etymology From back + light.
1
To illuminate something from behind.
It offers few subtleties, but those can be effective, as when the chorus is backlighted in the rear of the auditorium to produce an ominous play of shadows onstage.2007 June 2, James R. Oestreich, “Strange, Faraway Fantasies of Hell and Paradise”, in New York Times:
Backlit by the setting sun, an Avanti West Coast Class 390 Pendolino crosses the River Ribble at Preston on December 30 2022.2023 March 22, “Modern Images”, in RAIL, page 61, photo caption: