Gamut Rings

Outline

A colour gamut has traditionally been represented by the area of a triangle, the vertices of which represent the chromaticity coordinates of the display RGB primaries. However, this areal metric does not agree with the CIE definition of a colour gamut because it lacks the critical third dimension of colour: lightness. Hence, the area is referred to as a chromaticity gamut.

To visualise the 3D colour gamut more intuitively, a new method, called Gamut Rings, was developed for expressing true colour capability by presenting lightness, chroma, and hue in a 2D diagram.

Features

Gamut Rings were adopted as industry and international standards:

• SID/ICDM, Information Display Measurements Standard v1.2, 2023
• IEC 62977-3-5:2023, Evaluation of Optical Performance – Colour Capabilities
• IEC 62977-2-1:2021, Electronic Displays – Part 2-1: Measurements of Optical Characteristics – Fundamental Measurements
• CIE 246:2021, Colour Gamuts for Output Media