Color Image Capture
Point a digital camera at a scene, or place a photograph on aflat-bed scanner to create a digital picture. This is image cap-ture, where spectral colors are encoded as RGB pixels. In image capture, the gamut of the physical world is compressed and encoded into a digital image whose colors, almost by definition, only approximate the original. While consumer-grade scanners and cameras are becoming ubiquitous, high-quality image capture still involves skill and artistry. This is the second chapter on image reproduction. It describes the basic principles of image capture, encoding, and characterization.