The additive colour system uses different proportions of red, green and blue lights to create all other colours, in addition to white which is an equal combination of all three.
On sale: 14th Feb
We introduce the new and improved look of What Digital Camera with 102 camera reviews, while in a high-resolution battle, the Sony A7R and Nikon D800E go head to head, plus we've put together an essential guide to Wi-fi.
Which of the new cameras announced so far this year are you most excited about?
It may take 15 minutes for the system to update.