Edit File: convertXyz50ToLuv.js
import { k, e } from '../xyz50/constants.js'; import { D50 } from '../constants.js'; export const u_fn = (x, y, z) => (4 * x) / (x + 15 * y + 3 * z); export const v_fn = (x, y, z) => (9 * y) / (x + 15 * y + 3 * z); export const un = u_fn(D50.X, D50.Y, D50.Z); export const vn = v_fn(D50.X, D50.Y, D50.Z); const l_fn = value => (value <= e ? k * value : 116 * Math.cbrt(value) - 16); const convertXyz50ToLuv = ({ x, y, z, alpha }) => { let l = l_fn(y / D50.Y); let u = u_fn(x, y, z); let v = v_fn(x, y, z); // guard against NaNs produced by `xyz(0 0 0)` black if (!isFinite(u) || !isFinite(v)) { l = u = v = 0; } else { u = 13 * l * (u - un); v = 13 * l * (v - vn); } let res = { mode: 'luv', l, u, v }; if (alpha !== undefined) { res.alpha = alpha; } return res; }; export default convertXyz50ToLuv;
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