What is the tricolor of light and the three primary colors of pigments?

from the principle of color mixing, generally divided into optical three primary colors (following the principle of color addition) and printing three primary colors (following the principle of color subtraction)optical three primary colors: red, green, blueThe colors of the combination: red, green, yellow(yellow); green, blue, cyan), red, blue, magenta (Magenta); red, green, blue, white
the colors written here are all 100% color overlaysAs they are superimposed in proportion, different colorsprinted three primary colors: cyan, Magenta, Yellow (Yellow)combination of colors: cyan, magenta, shimmon, red, yellow, red, green, green, green, green, green, yellow, magenta, and blackthe colors written here are 100% color overlaysDifferent colors are produced as they are superimposed on different scalesBecause printing is the principle of reflecting light through ink to produce color, so the color of the reflected purity and the ink used has a great relationship, especially the cyan yellow three-color overlay into black in practical application can not achieve pure black, so in the printing will add a black, the formation of cyan yellow and black four colorstv, the display is the optical principle of the three primary colors, color is produced by the three-color superposition of different amountsbooks, posters and other printed materials are produced using the principle of color subtractionBecause the color on the optical and the color on the printing color principle is different, so they express the color range (color gamut) is also different, generally speaking, the optical color gamut contains the color gamut of the printingThis is why the color of the print sometimes does not reach the color displayed on the monitor or TVanother: the printing of the three colors, cyan refers to the general lying sky blue, magenta refers to the general lymcolor, rose redIn the early printing plants the average worker was called blue and redSo this causes the printing tricolor is: red, yellow and blue three colors of the reason This is confused with the optical red, green and blue So be careful at this point