Talk:HCL color space

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I removed the citations to the StackOverflow forum post because it is really not appropriate for wikipediaAamleshi (talk) 20:45, 6 May 2017 (UTC)

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Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 22:03, 17 January 2022 (UTC)

this article completely confuses and intermixes information about at least two different "HCL"/"LCH" colorspaces
Parts of this article (including the diagram) appear to be based on CIE LCHuv/HCLuv which is already described in the CIELUV article and appears to the be the colorspace described by one or both of two of the article's references

Other parts of this article, possibly the most important parts that define the colorspace mathematically, are instead based on Sarifuddin & Missaoui's 2005 HCL colorspace. Since this colorspace is "new" (as stated in its title) in 2005, clearly this can't be the same colorspace as CIE LCHuv/HCLuv which was created in 1976 (and was being referred to in Ihaka's 2003 article).

Even though they have some conceptual similarities, those are two completely different colorspaces! I appreciate the effort and intention of this article, but it seems to assume that any colorspace called "HCL" (or perhaps "LCH...") is the same, and intermixes information about these.

I haven't checked all the other references so I'm not sure whether they are referring to one or the other of the two colorspaces above, or to neither. It could be that some of them are referring to yet a third "HCL"-type colorspace such as CIE LCHab/HLCab which is also already described (this one in the CIELAB article).

In my opinion, this article should be marked for deletion unless it can be rewritten to be about a specific colorspace that is not already adequately covered in another article. Perhaps it should be solely about Sarifuddin & Missaoui's 2005 HCL, and it can compare this to CIE HCLuv/LCHuv and HCLab/LCHab as well as the others like HSL and HSV. But wikipedia is not supposed to have articles about a single paper (primary source) unless it has become notable by being used/cited by enough other notable sources, and even then, the article should ideally be based more on secondary sources rather than that primary source or its authors' other work.

QuoJar (talk) 15:20, 25 September 2017 (UTC)

This article also cites a criticism of Hunter Lab when discussing CIE Lab; these are not the same. In general I agree that this article is a strange conflation of similarly-named but very different colorspaces. The content is primarily about Sarifuddin & Missaoui's 2005 HCL, which is a fairly obscure and little cited paper. Deletion or substantial rewrite are required.

ChrisW3C (talk) 21:24, 9 February 2020 (UTC)


 * I should probably take the blame for keeping too much Sarifuddin. Before I touched this article it was mixing CIE and Sarifuddin together, using the parise on CIE to make Sarifuddin look good. I did a little bit of rewriting to separate these two, but was too hesitant to do any large-scale deletions. Well that is until today. --Artoria2e5 🌉 06:46, 5 September 2020 (UTC)