@macrostrat/column-components/dist/chroma-js/src/io/hsi/rgb2hsi.cjs

React rendering primitives for stratigraphic columns

"use strict";
const index = require("../../utils/index.cjs");
const unpack = require("../../utils/unpack.cjs");
const { min, sqrt, acos } = Math;
const rgb2hsi = (...args) => {
  let [r, g, b] = unpack(args, "rgb");
  r /= 255;
  g /= 255;
  b /= 255;
  let h;
  const min_ = min(r, g, b);
  const i = (r + g + b) / 3;
  const s = i > 0 ? 1 - min_ / i : 0;
  if (s === 0) {
    h = NaN;
  } else {
    h = (r - g + (r - b)) / 2;
    h /= sqrt((r - g) * (r - g) + (r - b) * (g - b));
    h = acos(h);
    if (b > g) {
      h = index.TWOPI - h;
    }
    h /= index.TWOPI;
  }
  return [h * 360, s, i];
};
module.exports = rgb2hsi;
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