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hue, saturation, brightness

<graphics> (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)


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