Combination of colors by superimposing beams of red, yellow, and/or blue light. The cumulative effect of these colors on the retina produces ranges of color.
Color produced by "adding" colors, usually the combination of red, green and blue.
Color produced by combining red, green, and blue light in varying intensities. Computer monitors use additive color, while the printing process uses subtractive color. This causes inconsistency between what a designer sees on the monitor and what comes off the printing press.