A colour gamut defines a more specific range of colours from the range of colours identifiable by the human eye.
- The range of perceived colours (visible to a human observer) is always greater than the range that can be reproduced by any digital process, or display device (screen, monitor, projector).
- Digital cameras, scanners, monitors, and printers are all limited to the range of colours they can sense, store and reproduce. A colour gamut is established to make these differences clear and to reconcile the colours that can be used in common between devices.
- A device that can reproduce the entire visible colour space corresponding with human perception is an unrealized goal within the engineering of display devices and printing processes.
- When colours within a colour space cannot be reproduced using a specific colour space or display device those colours are said to be out of gamut.