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a. a scale, esp (in medieval theory) one starting on the G on the bottom line of the bass staff
b. the whole range of notes
2. Physics the range of chromaticities that can be obtained by mixing three colours
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The gamut of a monitor is the set of colours it can display. There are some colours which can't be made up of a mixture of red, green and blue phosphor emissions and so can't be displayed by any monitor.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
color gamutThe entire range of colors available on a particular device such as a monitor or printer. A monitor, which displays RGB signals, typically has a greater color gamut than a printer, which uses CMYK inks. When a color is "out of gamut," it cannot be properly converted to the target device; for example, to a different type of printer. See color management system and color space.
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