Photographic lighting is the illumination of scenes to be photographed. A photograph simply records patterns of light, colour, and shade; lighting is all-important in controlling the image. In many cases even illumination is desired to give an accurate rendition of the scene.
Lighting is particularly important for monochrome photography, where there is no colour information, only the interplay of highlights and shadows. Lighting and exposure are used to create effects such as low-key and high-key.