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Existing light in the scene, as opposed to flash or video light added by the photographer

Ambient light is illumination already present in a scene, in contrast to flash/strobe or video lights supplied by the photographer.

They may be either natural light, such as the sun and moon, or artificial light sources that are already being used to light an area. If a source of ambient light, such as a table lamp, both illuminates some or all of the scene and is also included in the frame it is referred to as a practical light source.