In addition to controlling choices in aperture and shutter speed, light intensity also influences the range of possible ISO settings you can use. With digital cameras, ISO sensitivity settings represent the sensor's relative sensitivity to light. The higher ISO setting you use, the greater the amplification of the sensor, and the more sensitively it will react to light in a given scene. As with film ISO ratings, the higher the ISO you select, the less light is needed to make a correct exposure. Digital noise and other artifacts, however, tend to become more noticeable at higher ISO settings. Consequently, the lowest ISO sensitivity yields the best digital image quality the camera is capable of delivering.