Display color capability has traditionally been represented by a triangular area on an xy or u'v' chromaticity diagram. However, chromaticity diagrams cannot show color gamut because they lack the critical third dimension of luminance/lightness. Gamut rings have been developed and standardized (@IEC & ICDM) to express true color capability by showing lightness, chroma, and hue on a 2D diagram. This high‐speed automated prototype measures and calculates true color gamut and outputs gamut rings and their intersection to a reference color space, all within 60 seconds. Additionally, a real‐time color scope shows distribution of input video image color pixels on the rings diagram.