lib-colors
Version:
Simple node.js library for work with colors
22 lines (21 loc) • 720 B
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.labToXyz = labToXyz;
function labToXyz(lab) {
const { l, a, b, alpha } = { ...lab };
const refX = 95.047;
const refY = 100.0;
const refZ = 108.883;
const fy = (l + 16) / 116;
const fx = a / 500 + fy;
const fz = fy - b / 200;
const xNorm = fx > 0.206893 ? Math.pow(fx, 3) : (fx - 16 / 116) / 7.787;
const yNorm = fy > 0.206893 ? Math.pow(fy, 3) : (fy - 16 / 116) / 7.787;
const zNorm = fz > 0.206893 ? Math.pow(fz, 3) : (fz - 16 / 116) / 7.787;
return {
x: Math.max(0, xNorm * refX),
y: Math.max(0, yNorm * refY),
z: Math.max(0, zNorm * refZ),
alpha,
};
}