Edit File: convertLab65ToDlch.js
import { kCH, kE, sinθ, cosθ, θ, factor } from './constants.js'; import normalizeHue from '../util/normalizeHue.js'; /* Convert CIELab D65 to DIN99o LCh ================================ */ const convertLab65ToDlch = ({ l, a, b, alpha }) => { let e = a * cosθ + b * sinθ; let f = 0.83 * (b * cosθ - a * sinθ); let G = Math.sqrt(e * e + f * f); let res = { mode: 'dlch', l: (factor / kE) * Math.log(1 + 0.0039 * l), c: Math.log(1 + 0.075 * G) / (0.0435 * kCH * kE) }; if (res.c) { res.h = normalizeHue(((Math.atan2(f, e) + θ) / Math.PI) * 180); } if (alpha !== undefined) res.alpha = alpha; return res; }; export default convertLab65ToDlch;
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