Display system ability to determine approximate user working space luminance and illuminant white point should be built into the monitor and the data made available to the operating system. Scanners and Digital Cameras and Color Management Input devices such as scanners and digital cameras offer a different set of problems. Flatbed and film input scanners usually have software that directly controls their characteristics. If any characteristics are changed, they must be made available to the operating system and, subsequently, the color management system. Scanner data setting and setup values must be made available to the operating system and the color management system.
Digital cameras use outside sources of light.
These sources may be bright sun, a cloudy sky, tungsten lights in a home, fluorescent lighting in an office, and so on. The scene illuminant can vary both in spectral characteristics and intensity. All of these issues affect the digital picture. Knowing the approximate white point of the scene illumination is of great assistance to the color management system in improving the picture through color management techniques. Perhaps digital cameras should be equipped with a simple but effective RGB sensor in the camera body that records the light falling on the camera itself as a general indication of the scene white point.