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Re: Correct name of L in HSL color model

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I encountered HLS = Hue, Lightness, Saturation the first time here:

 

(1) J.Encarnacao, W.Strasser (diacritical characters simplified*): Computer Graphics, Oldenbourg 1986

(2) Foley, van Dam et al: Computer Graphics, Addison-Wesley 1990..1993

 

(1) contains an early reference to Wyszecki:

G.Wyszecki: Farbsysteme. Musterschmidt, Göttingen, 1960.

(1) and (2) mention Smith:

A.R.Smith: Color Gamut Transform Pairs, Computer Graphics., 12, 3, Aug.1978

 

It's safe to say, that L means Lightness. Luminance is a physically measurable quantity.

Lightness is used in HLS in the same sense as in CIELab.

Luminosity is a somewhat vague Photoshop nomenclature.

 

Using HSL instead of HLS is merely misspelling, quite common though.

 

[*diacritical characters: ordinary characters with tilde and accents etc.)

 

Best regards --Gernot Hoffmann


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