Add OKLCH color format

[bkuhlmann]

Is your feature request related to a problem? Please describe.

Hello. 👋 Would it be possible to add oklch color support? Here's a few supporting articles:

• OK, OKLCH
• Learn OKLCH

Describe the solution you'd like

It would be nice to see this as a toggle along with the other colors that are supported. Example:

Describe alternatives you've considered

Other than manually doing the conversion yourself, I'm not sure there is a good alternative for the moment.

[superhighfives]

Oooh, this would be great—thanks for taking the time to share, @bkuhlmann, and for the links to supporting articles.

The main things I'd need to do is work out the the math to convert to and from that format in Swift (taking into consideration that it looks like it's possible for it to return colours outside sRGB). On my list to take a look, but I don't have a firm timeline in mind. 😊

[mortyccp]

Maybe you can checkout this library https://github.com/importRyan/Oklab

[superhighfives]

Thanks for sharing, @mortyccp! Can take a look. If anyone else stumbles on this issue and wants to take a pass, I'd love to check out a PR too.