Lighting a scene Using just a key light results in a high-contrast scene, especially if the background is not illuminated. A fill light decreases contrast and adds more details to the dark areas of an image. An alternative to the fill light is to reflect existing light or to illuminate other objects in the scene, which in turn further illuminate the subject. The key light does not have to directly illuminate the subject: it may pass through various filters, screens, or reflectors. Light passing through tree leaves, window panes, and other obstacles can make a scene more visually interesting, as well as cue the audience to the location of the subject. The key light also does not have to be white light—a colored key (especially when used with fill or back lighting of other colors) can add more emotional depth to a scene than full white alone. In mixed indoor/outdoor daytime scenes, sunlight may appear to be a warm white, and indoor lighting to be a neutral or artificially-toned white. By contrast, moonlight appears to be cooler than indoor lighting.
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