1. Properties of color vision

1.1 Color perception

For any human being with normal eyesight, the notion of color is intuitive and helps to identify objects in everyday life; but there can be no question of color without a source of light (sunlight, light emitted by lamps, etc.). Most often, color seems to be a property of the surface of objects (green grass, for example); more rarely, it belongs to a volume (blue sky, red wine) and even more rarely it seems to be a characteristic of the light emitted by certain sources (bluish or reddish stars, yellow sodium light, light-emitting diodes, cathode-ray tube phosphors, etc.).

Color perception [1][2] results from the interaction...