Learn in the textbookFundamentals of Color and Image Representation
DefinitionAdditive color mixing (加法混色) creates colors by overlapping the three primary colors of light, red (R), green (G) and blue (B), and gets brighter the more colors are added.
ExplanationBecause light itself is being added together, each extra color increases the amount of light reaching the eye. Overlapping all three at equal, full strength gives white. Devices that show colors by giving off light, such as displays and projectors, work this way.
AnalogyIt is like adding flashlights one by one in a dark room: the wall they light up keeps getting brighter.
Memory hookLook at a screen through a magnifying glass and you can see rows of tiny red, green and blue dots.