Color Gamut
In the real world, the ideal of creating any visible color by mixing three primary colors is never actually achieved. The dyes, pigments, and phosphors used to create colors on paper or computer screens are imperfect and cannot recreate the full range of visible colors. The actual range of colors achievable by a particular device or medium is called its color gamut and this is mostly but not entirely determined by the characteristics of its primary colors. Since different devices such as computer monitors, printers, scanners, and photographic film all have different color gamuts, the problem of achieving consistent color is quite challenging. Different media also differ in their total dynamic range—how dark is the darkest achievable black and how light is the brightest white.