The colour of each pixel in an image is made up of a bit of Red, a bit of Green, and a bit of Blue.

If we have 8 bits for each colour, then we can have 256 different values.

Starting at zero, we can go up to 255.

A colour can therefore be described by its Red, Green and Blue values: e.g. pure green is 0 Red, 255 Green, and 0 Blue - or 0, 255, 0

Use the number counters on the right to see what colours these are: [255, 0, 0], [255,255,255]; [0,0,0].

Note that computer colour is light-based. So no colour means no light...means black. And full colour in all channels means pure white.

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