1. A color gamut refers to the range of colors that can be displayed or printed using a particular color system. The human eye can see a wider range of colors than any reproduction method. 2. The RGB gamut is the subset of colors that can be displayed on computer or TV monitors using red, green and blue light, though some colors like pure cyan or yellow cannot be accurately shown. 3. The CMYK gamut used in printing has an even smaller color range than RGB and uses cyan, magenta, yellow and black inks, with any colors outside this gamut called out-of-gamut colors.