What are the three primary colors?

Three primary colors add red, green and blue in different proportions to produce multiple colors. The main purpose of tricolor model is to detect, represent and display images in electronic systems (such as televisions and computers), but it is also used in traditional photography. Before the electronic age, based on human perception of color, tricolor model had a solid theoretical support.

Extended data:

Three primary colors are a device-dependent color space. Different devices detect and reproduce specific RGB values differently, because color substances (fluorescent agents or dyes) and their respective response levels to red, green and blue are different from different manufacturers, and even the time of the same device is different.

Due to gamma correction, the color output intensity on computer display devices is usually not proportional to the R, G and B values in image files. Even if the value of 0.5 is very close to half of 0 to 1.0 (full intensity), the light intensity (0.5, 0.5, 0.5) of computer display is usually about 22% of that of display (1.0, 1.0,1.