- From: Isaac Muse via GitHub <sysbot+gh@w3.org>
- Date: Mon, 28 Aug 2023 19:41:33 +0000
- To: public-css-archive@w3.org
I will note that not every algorithm for a color space is limitless, sometimes there are simply inherent limits to a color space
algorithm, and what you've stumbled on is simply the limit of HSL. HSL cannot properly handle such a color. It simply cannot round trip it.
```py
>>> Color('srgb', [1.5, 1, 0.5]).convert('hsl').convert('srgb')
color(srgb 1 1 1 / 1)
>>> Color('srgb', [1.49, 1, 0.5]).convert('hsl').convert('srgb')
color(srgb 1.49 1 0.5 / 1)
```
Negative saturation is how HSL deals with colors with a lightness that exceeds 100%. Large saturation is how it generally deals with colors saturated beyond its gamut. Now, none of this is by a design as it is only designed for in gamut colors, but more incidentally.
The example you've given is actually outside the visible gamut. I don't think such a value is a real world concern. If you are talking about a gamut such as Rec. 2020, I believe it should handle all colors in the gamut fine, but the shape will be far from a cylinder 🙂.
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Received on Monday, 28 August 2023 19:41:36 UTC