An Interactive Example

 

Additive Color System: a color system based on emitted light (as opposed to reflected). Black is achieved when all channels are set to zero and no light is emitted. When all the channels are on all the way, they combine to produce white (note this exactly the opposite of the more familiar subtractive system of inks, pigments and Play-Doh®). A full spectrum of colors are produced by varying the intensities of the various channels.

 

red:
 green:
blue:
or
 hex: