See Additiveprimarycolours, Subtractive primary colours.
参阅加色法原色，减色法原色。
2
Red, green and blue lights are called additiveprimarycolours because by the combination of these three primaries in different proportion , various coloured lights will produce.
红、绿和蓝三种色光称为加色法原色，因为不同份量的三原色，可以混合成各种不同色光。
3
Conventional printer characterisation models are generally based on the assumption that the densities of primarycolours are additive. However, additivity failure frequently occurs in practice.