Introduction to RGB and CMYK and when to use one or the other

When you’re viewing artwork and documents on a monitor, every colour on your display is rendered in RGB — Red, Green and Blue — because every pixel of your monitor is made up of those three colours. When you’re viewing artwork that has been printed by your desktop inkjet printer, an industrial inkjet printer or an offset press, the colours are rendered in CMYK — Cyan, Magenta, Yellow and Black – which are the colours of the printer’s ink. These two colour modes are available in most photo and paint apps and it’s important to realise that they differ considerably in their approach towards colour reproduction.