RGB Color Model

In the RGB color model, we use red, green, and blue as the 3 primary colors. We don't actually specify what wavelengths these primary colors correspond to, so this will be different for different types of output media, e.g., different monitors, film, videotape, slides, etc.

This is an additive model since the phosphors are emitting light. A subtractive model would be one in which the color is the reflected light. We can represent the RGB model by using a unit cube. Each point in the cube (or vector where the other point is the origin) represents a specific color. This model is the best for setting the electron guns for a CRT.

Note that for the "complementary" colors the sum of the values equals white light (1, 1, 1). For example:
red (1, 0, 0) + cyan (0, 1, 1) = white (1, 1, 1)
green (0, 1, 0) + magenta (1, 0, 1) = white (1, 1, 1)
blue (0, 0, 1) + yellow (1, 1, 0) = white (1, 1, 1)



Main Color page
HyperGraph Home page.

Last changed February 16, 2001, G. Scott Owen, owen@siggraph.org