chroma-js/src/io/cmyk/rgb2cmyk.js

JavaScript library for color conversions

import { unpack } from '../../utils/index.js';
const { max } = Math;

const rgb2cmyk = (...args) => {
    let [r, g, b] = unpack(args, 'rgb');
    r = r / 255;
    g = g / 255;
    b = b / 255;
    const k = 1 - max(r, max(g, b));
    const f = k < 1 ? 1 / (1 - k) : 0;
    const c = (1 - r - k) * f;
    const m = (1 - g - k) * f;
    const y = (1 - b - k) * f;
    return [c, m, y, k];
};

export default rgb2cmyk;