Some of us learnt at school that there are three primary colours in a paint-box, red, yellow and blue, and we could make up other combinations by mixing them -
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Some of us learnt at school that there are three primary colours in a paint-box, red, yellow and blue, and we could make up other combinations by mixing them -
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Computer colours are made up in a similar way, but using red, green and blue - RGB for short. The different shades are expressed by describing how much of each of those three colours is present; and 'how much' is expressed as a proportion of 256 different values
(2 x 2 x 2 x 2 x 2 x 2 x 2 x 2)
although since "0" is one of the values, the highest number is 255...
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So black is "everything = zero", |
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white is "everything = 255"; |
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'pure red' is |
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while equal quantities of each produce different greys |
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The total number of
combinations... 
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