lib-colors/dist/rgb/helpers/rgb_to_lab.helper.js

Simple node.js library for work with colors

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.rgbToLab = rgbToLab;
const xyz_to_lab_helper_1 = require("../../lab/helpers/xyz_to_lab.helper");
function rgbToLab(rgb) {
    const xyz = rgbToXyz(rgb);
    return (0, xyz_to_lab_helper_1.xyzToLab)(xyz);
}
function rgbToXyz(rgb) {
    let { r, g, b, a } = { ...rgb };
    r /= 255;
    g /= 255;
    b /= 255;
    r = r > 0.04045 ? Math.pow((r + 0.055) / 1.055, 2.4) : r / 12.92;
    g = g > 0.04045 ? Math.pow((g + 0.055) / 1.055, 2.4) : g / 12.92;
    b = b > 0.04045 ? Math.pow((b + 0.055) / 1.055, 2.4) : b / 12.92;
    const x = (r * 0.4124564 + g * 0.3575761 + b * 0.1804375) * 100;
    const y = (r * 0.2126729 + g * 0.7151522 + b * 0.072175) * 100;
    const z = (r * 0.0193339 + g * 0.119192 + b * 0.9503041) * 100;
    return { x, y, z, alpha: a };
}