Color complementary color law

White light can be decomposed into three primary colors of red, green, and blue, and red, green, and blue light can be mixed to become white light. This shows that there is a certain link between colored light and white light.
Complementary color refers to two complementary color lights that can generate white light or gray light after additive color mixing; after subtractive color mixing, two complementary colorants of black or gray color are generated. That is, blue and red are complementary colors, magenta and green are complementary colors, and yellow and blue are complementary colors.

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