Edit File: convertDlchToLab65.js
import { kCH, kE, sinθ, cosθ, θ, factor } from './constants.js'; /* Convert DIN99o LCh to CIELab D65 -------------------------------- */ const convertDlchToLab65 = ({ l, c, h, alpha }) => { let res = { mode: 'lab65', l: (Math.exp((l * kE) / factor) - 1) / 0.0039 }; if (h === undefined) { res.a = res.b = 0; } else { let G = (Math.exp(0.0435 * c * kCH * kE) - 1) / 0.075; let e = G * Math.cos((h / 180) * Math.PI - θ); let f = G * Math.sin((h / 180) * Math.PI - θ); res.a = e * cosθ - (f / 0.83) * sinθ; res.b = e * sinθ + (f / 0.83) * cosθ; } if (alpha !== undefined) res.alpha = alpha; return res; }; export default convertDlchToLab65;
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