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HSV

Rotate the hue, push the saturation, lift or drop the value, in the colour space designers already know.

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Hue, saturation and value

HSV describes each colour by its hue (the position around the colour wheel), its saturation (how far it is from grey) and its value (how bright it is). Working in those terms makes a colour shift easy to predict: rotate the hue and the reds move toward oranges, push the saturation and the colours get richer.

Hue rotates the full way round, so the same control can swap a palette completely. Saturation and value scale the colours rather than shifting them, which keeps the tonal structure of the image intact.

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