Talk:CIELAB color space

Nice overview of the theory, no practical use.
The formulas for XYZ to LAB differ from those presented here: http://www.brucelindbloom.com/index.html?Eqn_XYZ_to_Lab.html

Replace the article with cielab03022003.pdf, clearer, easier to understand. This article reads like a term paper someone with no experience or knowledge of color theory wrote. Bits and pieces lifted from the references, nothing to tie it together. "CIELab Color Space" by Gernot Hoffmann offers practical information on converting from sRGB to L*, a*, b*. It shows the relationship between CIELab and CIEXYZ. Find an author who has studied Wyszecki & Styles Color Science.

Regarding the formulas: "X, Y, Z are the tristimulus values of the test colour stimulus based on the CIE 1931 standard colorimetric system defined in CIE S 014-1, and Xn, Yn, Zn are the corresponding tristimulus values of a specified white stimulus."

http://www.unife.it/scienze/astro-fisica/insegnamenti/ottica-applicata/materiale-didattico/colorimetria/CIE%20DS%20014-4.3.pdf

Delete the article and start over. Hpfeil (talk) 00:48, 17 November 2019 (UTC)


 * There are probably some good points in your post although I think few will look for them due to the rude way that you posted. While Wikipedia (any any place that protects intellectual property) would preclude copying whatever you are referring to to become the article, it would certainly be interesting to look at it.  But you just gave a .pdf file name which no link or whatever to find or, or even info on it to use for a search.  The links that you did give go to some equations and to a draft standard.  Certainly interesting, but nothing that provides what you say that this article doesn't. North8000 (talk) 22:05, 1 December 2019 (UTC)


 * I'd say Hpfeil's comments are just trolling. Nothing he posted or said above has merit. Sure Bruce's site is great, and I and many use it, but it is not the canonical reference for the standard, only the CIE is, I'll review the math but last time I looked it was the CIE official method.


 * The pdf with no link Hpfeil demands we use is the Gernot Hoffmann pdf a document which is wrong and still wrong even in the Sept 2019 edition, not only incorrect values for sRGB, but using the rounded values for Lab which have long since been corrected to the appropriate fractions, see instead: CIE colorimetry 15-3 which covers all of this, and is available online on the wayback. Not only that, but claiming that that Hoffmann trainwreck of a document is somehow easier to parse is absurd. It's a mess, it's wrong, it should be disregarded.


 * And (laughably) the CIE draft standard he links to provides the same values as in the article (not Bruce's). His "delete and start over" indicates a misunderstanding of how Wikipedia works I think.... --Myndex (talk) 15:21, 12 December 2020 (UTC)

Nice addition
I took a hard look at the recent addition to the xrite white paper link, being company related. But it as excellent & non-commercial piece. I think more informative than our article here. :-) Sincerely, North8000 (talk) 14:14, 6 February 2020 (UTC)
 * I agree, it's a solid source and appropriate for an EL. -- 15:01, 6 February 2020 (UTC)
 * After seeing these comments I got suspicious that you two were involved with X-rite and set out to check the link myself. I agree that the PDF is very good, and a good EL, which is a rare thing. BernardoSulzbach (talk) 12:52, 7 February 2020 (UTC)
 * Cool. It's good to be  suspicious/careful. North8000 (talk) 16:09, 7 February 2020 (UTC)

Integrated wavelength in CIELAB?
what is the meaning of 'intigrated wavelength' in CIELAB? 2409:40C1:103E:FF0F:2582:F945:CABA:ACB2 (talk) 18:10, 29 January 2024 (UTC)


 * This is a venue for discussing improvements to the Wikipedia article CIELAB color space, not for general discussion of the topic of CIELAB. Our article doesn't mention "integrated wavelength" as far as I can tell, but if you are encountering that somewhere it probably is talking about the definite integral of a spectral power distribution, possibly multiplied by spectral sensitivity of some detector or CIEXYZ color matching functions. If you have more questions about this, or for future similar questions, please go to Reference_desk/Science. –jacobolus (t) 17:31, 22 June 2024 (UTC)