Red, Green, and Blue (RGB) are the three primary colors of light. In any light generating device (like computer screens), RGB blends these three colors to produce all other colors.
There are two types of color profiles: additive and subtractive. RGB is an additive profile because you create new colors by adding primary colors of light together.
Green light + blue light = cyan Blue light + red light = magenta Red light + green light = yellow Red light + green light + blue light = white
With RGB, the color gamut is very wide, so it can produce a broad range of colors. This is because it essentially mirrors how our eyes see color. In our retinas, we have three different kinds of cone cells that pick up on red, green and blue light. Our brain then blends together the different signals that the cells receive, producing an astonishing array of color.
Of course, this all depends on one key factor: light. Anything that’s printed doesn’t generate light, it reflects it. So, how do you reproduce color in print, if there’s no light source?
The answer is that you don’t add, you subtract, which is where CMYK comes into play.
The RGB color model