What is a colour space?

Reblogged from Colour chat:

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In my job I probably use the phrase "colour space" every day and have done for the last 20 years. So imagine my surprise when I was talking with a colleague recently and after a few minutes he said "Can I stop you for a second there Steve - when you say colour space, what exactly do you mean?".

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Since I am deconstructing the rainbow/spectrum in RGB, HSV color spaces, I will show it in dichromat "color space", and finally will then make a new one in CIE L*a*b* color space I thought I should include a review of the basics. So what is a color space? This good post answers that question.