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What are OKLCH colors?

(jakub.kr)
856 points tontonius | 3 comments | 25 Aug 25 06:32 UTC | HN request time: 0.916s | source
1. karmakaze ◴[25 Aug 25 13:27 UTC] No.45013628[source]▶
Why is there no documented formula to convert to from this color space? A quick google and the best I could find is this Gist[0]. Searching for Oklab has a Wikipedia page[1].

[0] https://gist.github.com/dkaraush/65d19d61396f5f3cd8ba7d1b4b3...

[1] https://en.wikipedia.org/wiki/Oklab_color_space

replies(2): >>45013679 #>>45013703 #
2. shrx ◴[25 Aug 25 13:33 UTC] No.45013679[source]▶
It looks to me that all the "magic" is in the matrices used for conversion between Oklab and sRGB. The final conversion between Oklab and Oklch is trivial, and is documented in your linked Wikipedia article.
3. dwringer ◴[25 Aug 25 13:36 UTC] No.45013703[source]▶
OKLCh is the same space as OKLab, it's just polar coordinates versus rectangular coordinates.