The complete range of colors a color space can represent or a device can display.
Definition
Gamut refers to the range of all reproducible colors within a color space or by a device. Visualized as a triangle in the CIE chromaticity diagram, defined by the primary colors.
Practical Application
Wide Gamut monitors (P3, Rec.2020) can display more intense colors. Gamut mapping converts between color spaces without clipping. ACES offers a vast gamut for archiving.
Technical Details
Rec.709 covers ~36% of the visible color spectrum. DCI-P3 ~45%. Rec.2020 ~76%. Out-of-Gamut colors must be mapped - different algorithms (Clipping, Compression, Perceptual) yield different results.