G Gamut 113 The spectrum of colours that scanners, monitors, software applications and printing processes can reproduce. The gamut defines the range of colours that are at the designer's disposal. Using colours at the fringes of the gamut will mean it will be difficult to ensure they remain faithful to the original design if it is transferred from one device to another. Pictured below is a gamut diagram in which the red line represents the Hexachrome gamut, the blue line represents the RGB gamut, and the green line represents the CMYK gamut. The outer black line denotes the spectral colour gamut.