Colour management is a process that governs how colour is translated from one piece of equipment to another. Colour management is needed to ensure accurate and predictable colour reproductions because each device responds to or produces colour differently. 

Basic Terminology

A great deal of terminology is used to describe colour and its various functions.

As colour is essentially different wavelengths of light, design and colour professionals use different values of hue, saturation and brightness to describe it. Importantly for designers, there are two main colour models, on that relates to screen (RGB), and one that relates to print (CMYK). 

CMYK

RGB

The above images are A3 layouts that i produced for the colour 4 print brief i was set, on RGB and CMYK.