Some digital cameras use multiple CCDs to capture red, green and blue values.
Color values captured by a digital camera can be displayed directly on a computer monitor. Color images captured on photographic film or paper can be digitized by an electronic scanner. High-quality scanners use photomultiplier tubes to digitize images on a rotating drum. One scan line is recorded with each revolution of the drum. Drum scanners are designed for graphic arts applications, so they convert color to CMYK values used in printing.