convertLuvToXyz50.js•711 B
import { k } 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 convertLuvToXyz50 = ({ l, u, v, alpha }) => {
let up = u / (13 * l) + un;
let vp = v / (13 * l) + vn;
let y = D50.Y * (l <= 8 ? l / k : Math.pow((l + 16) / 116, 3));
let x = (y * (9 * up)) / (4 * vp);
let z = (y * (12 - 3 * up - 20 * vp)) / (4 * vp);
let res = { mode: 'xyz50', x, y, z };
if (alpha !== undefined) {
res.alpha = alpha;
}
return res;
};
export default convertLuvToXyz50;