Which color model is based on the primary colors of light?

The RGB color model is based on the primary colors of light: red, green, and blue. This model operates on the additive color theory, where various combinations of these three colors are used to create a broad spectrum of other colors. In the RGB model, when red, green, and blue light are combined in different intensities, they can produce a wide range of colors visible to the human eye, with the combination of all three at full intensity resulting in white light.

In contrast, CMYK is a subtractive color model primarily used in color printing, where cyan, magenta, yellow, and key (black) are mixed to absorb light and create colors on paper. The HSB (Hue, Saturation, Brightness) model describes colors in terms of their hue, saturation, and brightness, making it more intuitive for understanding how colors change in terms of human perception rather than lighting. The LAB color model, which is designed to be device-independent, enables a uniform distribution of colors as perceived by humans across different devices, but it does not directly relate to primary colors of light.