Thus, for each color channel (red, green, blue) there has to be a separate chip. Problem 3: Multi-Chip Cameras A normal (CCD or CMOS) camera chip can only sense intensities of light (by collecting over some period). So-called dithering algorithms (there are many) convert gayscale information into a point raster. Problem 2: Half-Toning Printer can only place single points on paper. For example, a printer can print a color, which cannot be sensed by the CCD-line camera of a scanner. Problem 1: Color Gamut Typical technical devices (printer, scanner, monitor, copier, camera) can only cover part of the spectrum of colors, which can be perceived by the human eye.
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