Red, green, and blue are called the three primary colors. These three colors are mixed in different proportions to produce a variety of colors. There are two basic methods for color mixing: additive color mixing and subtractive color mixing. The so-called additive color mixing is when the different colors of light are mixed, they add together the parts occupied in the spectrum to produce a new mixed color method. Subtractive mixing is the method of producing a synthetic color effect by selectively absorbing a corresponding portion of the incident light from the incident light when mixed in different colors. If any two kinds of color light are added, if white light is generated, the two color lights are called complement light (complementary color). When the primary colors of yellow, magenta, and cyan are overlapped, black will be produced. In the process of subtractive color method, the density changes of the three subtracted primary colors respectively control the absorption ratios of red, green and blue, thereby obtaining various mixed colors, which can achieve the same effect mixed with the additive color method.
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