System for describing colors based on a combination of values for Red, Green, and Blue - the additive primaries. RGB is the basic additive color model used for color video display. Mixing various percentages of red, green, and blue light can recreate most of the spectrum; combining 100% of all three creates white light.

The RGB color space is based on light. It breaks any color down to an RGB representation, or in other words, any defined color is some amount of R (Red), G (Green), and B (Blue). Televisions and computer monitors function in this manner - if you look very closely on your monitor or TV you will notice that all the dots are Red, Green, or Blue. When you turn your computer monitor off, the screen is black because no red, green, or blue dots are lit up. If you turn the monitor on, and look at a white page on the screen, then all red, green, and blue dots are shining at full potential. True white light is actually composed of a full spectrum of colors, not just RGB, but RGB provides a close enough representation for most purposes.

This color space is referred to as "additive" because when you add all the colors together, it creates white.

See Color Model.

See CMYK.