index.js

/* HEX TO _____ Codes */
const hexToHSL = (hex) => {
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);

  var r = parseInt(result[1], 16);
  var g = parseInt(result[2], 16);
  var b = parseInt(result[3], 16);

  r /= 255;
  g /= 255;
  b /= 255;
  var max = Math.max(r, g, b),
    min = Math.min(r, g, b);
  var h,
    s,
    l = (max + min) / 2;

  if (max === min) {
    h = s = 0; // achromatic
  } else {
    var d = max - min;
    s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
    switch (max) {
      case r:
        h = (g - b) / d + (g < b ? 6 : 0);
        break;
      case g:
        h = (b - r) / d + 2;
        break;
      case b:
        h = (r - g) / d + 4;
        break;
      default:
        break;
    }
    h /= 6;
  }

  s = s * 100;
  s = Math.round(s);
  l = l * 100;
  l = Math.round(l);
  h = Math.round(360 * h);

  var colorInHSL = 'hsl(' + h + ',' + s + '%,' + l + '%)';
  return colorInHSL;
};

const hexToRGB = (hex) => {
  // remove the # in the beginning
  hex = hex.replace('#', '');
  var r = parseInt(hex.substring(0, 2), 16);
  var g = parseInt(hex.substring(2, 4), 16);
  var b = parseInt(hex.substring(4, 6), 16);
  return 'rgb(' + r + ',' + g + ',' + b + ')';
};

const hexToCMYK = (hex) => {
    var computedC = 0;
    var computedM = 0;
    var computedY = 0;
    var computedK = 0;
   
    hex = (hex.charAt(0)=="#") ? hex.substring(1,7) : hex;
   
    if (hex.length != 6) {
     alert ('Invalid length of the input hex value!');   
     return; 
    }
    if (/[0-9a-f]{6}/i.test(hex) != true) {
     alert ('Invalid digits in the input hex value!');
     return; 
    }
   
    var r = parseInt(hex.substring(0,2),16); 
    var g = parseInt(hex.substring(2,4),16); 
    var b = parseInt(hex.substring(4,6),16); 
   
    // BLACK
    if (r==0 && g==0 && b==0) {
     computedK = 1;
     return [0,0,0,1];
    }
   
    computedC = 1 - (r/255);
    computedM = 1 - (g/255);
    computedY = 1 - (b/255);
   
    var minCMY = Math.min(computedC,Math.min(computedM,computedY));
   
    computedC = (computedC - minCMY) / (1 - minCMY) ;
    computedM = (computedM - minCMY) / (1 - minCMY) ;
    computedY = (computedY - minCMY) / (1 - minCMY) ;
    computedK = minCMY;
   
    return `cmyk(${computedC.toFixed(2)},${computedM.toFixed(2)},${computedY.toFixed(2)},${computedK.toFixed(2)})`;
}

exports.hexToRGB  = hexToRGB;
exports.hexToHSL  = hexToHSL ;
exports.hexToCMYK  = hexToCMYK ;

/* RGB TO _____ Codes */