The relationship between addition and subtraction of additive effect

Additive method and subtractive method are aimed at colored light, additive method refers to the addition of colored light, and subtractive method refers to the weakening of colored light. Additive method is a method of color matching with light. Subtraction is a method of mixing pigments to produce color.

Additive method is a color effect produced by two or more colored lights simultaneously stimulating human optic nerve; Subtraction method refers to subtracting a part of colored light from white light or other polychromatic light to produce a color effect stimulated by another colored light.

From the complementary relationship, there are three pairs of complementary colors: R-C; g-M； B-Y. In the color light additive method, complementary colors are added to obtain white; In the pigment subtractive method, complementary colors are added to obtain black.