The intensity, direction, and quality of lighting have a profound effect on the way an image is perceived. Light affects the way colors are rendered, both in terms of hue and depth, and can focus attention on particular elements of the composition. Much like movement in the cinema, the history of lighting technology is intrisically linked to the history of film style. Most mainstream films rely on the three point lighting style, and its genre variations. Other films, for example documentaries and realist cinema, rely on natural light to create a sense of authenticity.
The standard lighting scheme for classical narrative cinema. In order to model an actor's face (or another object) with a sense of depth, light from three directions is used, as in the diagram below. A backlight picks out the subject from its background, a bright key light highlights the object and a fill light from the opposite side ensures that the key light casts only faint shadows.
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