HSB refers to Hue, saturation, brightness, a variation of the HSV color space.

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Photoshop: how to change the saturation retaining hue and brightness?

I would like to to change the saturation of all the color of an image to a fixed amount retaining the original hue and brightness. One could think that this is easily achieved by the sautration ...
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Does hue/sat/lum offer a smaller range of colors than RGB?

All values of RGB should be unique and distinguishable, meaning there are truly 256*256*256 colors. In HSL, however, if L=0 then H and S can be anything, but you still get the same color (black). ...
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What is HSB really?

Can any of my graphics designer friends explain HSB to me? I know it's hue/saturation/brightness and I know what those three do (for the most part)... I understand the algorithm of creating colors ...