RGB

RGB is an additive color model in which red, green, and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three primary colors, red, green, and blue. The RGB model is used by computer monitors and most all electronic color displays. Since printing requires a subtractive color model RGB files are converted to the closest equivalent CMYK build. This is done automatically when printing if the file is not already converted to CMYK.