A definition of out of gamut is that the color cannot be properly converted to the target device, because convex hull formed by SR,SG,SBS_R, S_G, S_BSR,SG,SB of the display on the chromaticity diagram doesn't include the color we want.
A definition of out of gamut is that the color cannot be properly converted to the target device, because convex hull formed by SR,SG,SB of the display on the chromaticity diagram doesn't include the color we want.