@macrostrat/column-components/dist/chroma-js/src/io/oklab/rgb2oklab.cjs

React rendering primitives for stratigraphic columns

"use strict";
require("../../utils/type.cjs");
const unpack = require("../../utils/unpack.cjs");
const multiplyMatrices = require("../../utils/multiply-matrices.cjs");
const rgb2lab = require("../lab/rgb2lab.cjs");
const rgb2oklab = (...args) => {
  const [r, g, b, ...rest] = unpack(args, "rgb");
  const xyz = rgb2lab.rgb2xyz(r, g, b);
  const oklab = XYZ_to_OKLab(xyz);
  return [...oklab, ...rest.length > 0 && rest[0] < 1 ? [rest[0]] : []];
};
function XYZ_to_OKLab(XYZ) {
  const XYZtoLMS = [
    [0.819022437996703, 0.3619062600528904, -0.1288737815209879],
    [0.0329836539323885, 0.9292868615863434, 0.0361446663506424],
    [0.0481771893596242, 0.2642395317527308, 0.6335478284694309]
  ];
  const LMStoOKLab = [
    [0.210454268309314, 0.7936177747023054, -0.0040720430116193],
    [1.9779985324311684, -2.42859224204858, 0.450593709617411],
    [0.0259040424655478, 0.7827717124575296, -0.8086757549230774]
  ];
  const LMS = multiplyMatrices(XYZtoLMS, XYZ);
  return multiplyMatrices(
    LMStoOKLab,
    LMS.map((c) => Math.cbrt(c))
  );
}
module.exports = rgb2oklab;
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