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I think it would be a good idea to get back to the basics. It's a large post, so there's a recap at the end. Colour can be represented in a couple of ways. We can have Red, Green and Blue (RGB). We could have CMYK (used in printing). There's also YCbCr/YUV (one for luminance and two for colour) and similar flavours of that. We have HSV/HSL/HSB (hue, ...

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