- From: Natalie Weizenbaum via GitHub <sysbot+gh@w3.org>
- Date: Tue, 17 Oct 2023 00:00:44 +0000
- To: public-css-archive@w3.org
nex3 has just created a new issue for https://github.com/w3c/csswg-drafts: == [css-color-4] Sample color conversion code leads to NaN values == The sample code for converting from XYZ to OKLab involves taking the cube root of the result of multiplying the XYZ color by the `XYZtoLMS` matrix. This is undefined for negative numbers, and returns `NaN`, despite the fact that the XYZ color space is notionally unbounded and thus could very easily produce negative numbers. This comes up even with fairly reasonable in-bounds colors. For example, `lab(0.01% 35 1)` is equivalent to `xyz(0.008679770007260038 0.000011070564598794538 -0.0005206593067627204)`, which converts to LMS as `[0.006751691618866409, 0.000022646971037596888, -0.00003832537822546193]`. Should the LMS logic clamp channels so that they're 0 at minimum? Should it take the cube root of the absolute value and then match the sign afterwards? Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/9477 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Tuesday, 17 October 2023 00:00:45 UTC