It is easier to understand additive primaries through a chromaticity diagram. You can form colors by mixing the primaries, and the gamut is determined by the hu

It is easier to understand additive primaries through a chromaticity diagram. You can form colors by mixing the primaries, and the gamut is determined by the hull of the primaries. Obviously you need at least three of them to enclose a space. https://commons.wikimedia.org/wiki/File:CIE1931xy_gamut_comparison.svg https://commons.wikimedia.org/wiki/File:CIE1931xy_gamut_comp...