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What is color gamut ?

Aug 24th,2018

A colour gamut defines a more specific range of colours from the range of colours identifiable by the human eye (i.e., the visible spectrum). While colour imaging devices include a wide range of devices, such as digital cameras, scanners, monitors, and printers, since the range of colours they can reproduce varies, the colour gamut is established to make these differences clear and to reconcile the colours that can be used in common between devices.

Various methods are used to express (diagram) the colour gamut, but the common method used for display products is the xy chromaticity diagram of the XYZ colour system established by the International Commission on Illumination (CIE). In an xy chromaticity diagram, the colours of the visible range are represented using numerical figures and graphed as colour coordinates. In the following xy chromaticity diagram, the area shaped like an upside-down "U" surrounded by dotted lines indicates the range of colours visible to human beings with the naked eye.

Various standards govern colour gamuts. The three standards frequently cited in relation to personal computers are sRGB, Adobe RGB, and NTSC. The colour gamut defined by each standard is depicted as a triangle on the xy chromaticity diagram. These triangles show the peak RGB coordinates connected by straight lines. a larger area inside a triangle is regarded to represent a standard capable of displaying more colours. For LCD monitors, this means that a product compatible with a colour gamut associated with a larger triangle can reproduce a wider range of colours on screen.