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HSL (Hue Saturation Luminosity) - bring your mouse all the way down to bring saturation to 0% or close and then scroll down to bring luminosity down to black or up to white.

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Ummm, sorry but that's not correct; it is Hue, Saturation and Lightness. You are confusing luminosity with lightness:

http://en.wikipedia.org/wiki/HSL_and_HSV http://en.wikipedia.org/wiki/Luminosity

I stand corrected then. It's not really that important anyways.

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