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Digital Colour Theory

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What is colour theory? It is the theory behind colour mixing and colour combination.

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CMYK Colour Model For printers Subtractive colour model Composite Black Process Black

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RGB Colour Model For screens Additive colour model

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RGB in Digital Imaging The colour of each pixel in a digital image is made up of RGB

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Example of a True Colour Image Bit-depth = 24-bits 8-bits > Red 8-bits > Green 8-bits > Blue

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Example of a True Colour Image 8 bits = 256 colours 256 Red intensities 256 Green intensities 256 Blue intensities

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Example of a True Colour Image 256 x 256 x 256 = 16.7 million colours

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How do we numerically represent RGB colours?

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What is hexadecimal? Decimal: Base-10 0123456789 Binary: Base-2 01 Hexadecimal: Base-16 0123456789ABCDEF

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#FF0000

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Why we use hexadecimal? It is more user friendly when compared to binary. Example of the colour Red 11111111 00000000 00000000 FF 00 00

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What is HSB?

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What is a Colour Gamut?

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What is Gamut Conversion?