The word 'Gamut' simply means a complete range or scope of something. However when colour is concerned a gamut means a range of colours available on a certain device or platform. For example, a computer or tv screen displays colours by mixing RGB light, so the gamut is fairly large (as shown by the diagram below). A print based piece such as a newspaper or magazine uses CYMK mixing to display colour, and therefore the gamut is smaller. A gamut is useful if you want to preview how something is going to look when printed, as it can show the range of colours available on the device being used.
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