Source : Free On-Line Dictionary of Computing

hue, saturation, brightness
     
         (HSB) A {colour model} that describes colours in
        terms of {hue}, {saturation}, and {brightness}.
     
        In the tables below, a hue is a "pure" colour, i.e. one with
        no black or white in it.  A shade is a "dark" colour, i.e. one
        produced by mixing a hue with black.  A tint is a "light"
        colour, i.e. one produced by mixing a hue with white.  A tone
        is a colour produced by mixing a hue with a shade of grey.
     
        {Microsoft Windows} colour dialogs, {PagePlus}, and {Paint
        Shop Pro} use {HSB} but call the third dimension "luminosity"
        or "lightness".  It ranges from 0% (black) to 100% (white).  A
        pure hue is 50% luminosity, 100% saturation.
     
         Colour type   S      L
         Black        Any     0%
         White        Any    100%
         Grey          0%    1-99%
         Hue          100%    50%
         Shade        100%   1-49%
         Tint         100%  51-99%
         Tone         1-99%  1-99%
     
        {Quattro Pro}, {CorelDraw}, and {PhotoShop} use a variant
        (Quattro Pro calls the third parameter "brightness") in which
        a brightness of 100% can produce white, a pure hue, or
        anything in between, depending on the saturation.
     
         Colour type   S      B
         Black        Any     0%
         White         0%    100%
         Grey          0%    1-99%
         Hue          100%   100%
         Shade        100%   1-99%
         Tint         1-99%  100%
         Tone         1-99%  1-99%
     
        [Same as {HSV}?]
     
        (1999-07-05)