RGB and CMYK

There are to groups of colours and these are the RGB and CMYK.

RGB (red, green and blue), is the colour space monitors uses. It starts with black (darkness) and after it adds all the colours mentioned, it finishes with white. Every colour project itself to be visible.

RGB

CMYK (cyan, magenta, yellow, and black), is the colour space printers uses. To the opposite of the RGB, this colour space starts with white (the paper) and if all the colours are used it will finishes with black.

CMYK

Reference:

http://graphicdesign.stackexchange.com/questions/60/what-is-the-difference-between-cmyk-and-rgb-are-there-other-color-spaces-i-shou