Hex code to Color Name

by Dhruvang Gajjar

JavaScript

var ntc = {

  init: function() {
    var color, rgb, hsl;
    for (var i = 0; i < ntc.names.length; i++) {
      color = "#" + ntc.names[i][0];
      rgb = ntc.rgb(color);
      hsl = ntc.hsl(color);
      ntc.names[i].push(rgb[0], rgb[1], rgb[2], hsl[0], hsl[1], hsl[2]);
    }
  },

  name: function(color) {

    color = color.toUpperCase();
    if (color.length < 3 || color.length > 7)
      return ["#000000", "Invalid Color: " + color, false];
    if (color.length % 3 == 0)
      color = "#" + color;
    if (color.length == 4)
      color = "#" + color.substr(1, 1) + color.substr(1, 1) + color.substr(2, 1) + color.substr(2, 1) + color.substr(3, 1) + color.substr(3, 1);

    var rgb = ntc.rgb(color);
    var r = rgb[0],
      g = rgb[1],
      b = rgb[2];
    var hsl = ntc.hsl(color);
    var h = hsl[0],
      s = hsl[1],
      l = hsl[2];
    var ndf1 = 0;
    ndf2 = 0;
    ndf = 0;
    var cl = -1,
      df = -1;

    for (var i = 0; i < ntc.names.length; i++) {
      if (color == "#" + ntc.names[i][0])
        return ["#" + ntc.names[i][0], ntc.names[i][1], true];

      ndf1 = Math.pow(r - ntc.names[i][2], 2) + Math.pow(g - ntc.names[i][3], 2) + Math.pow(b - ntc.names[i][4], 2);
      ndf2 = Math.pow(h - ntc.names[i][5], 2) + Math.pow(s - ntc.names[i][6], 2) + Math.pow(l - ntc.names[i][7], 2);
      ndf = ndf1 + ndf2 * 2;
      if (df < 0 || df > ndf) {
        df = ndf;
        cl = i;
      }
    }

    return (cl < 0 ? ["#000000", "Invalid Color: " + color, false] : ["#" + ntc.names[cl][0], ntc.names[cl][1], false]);
  },

  // adopted from: Farbtastic 1.2
  // http://acko.net/dev/farbtastic
  hsl: function(color) {

    var rgb = [parseInt('0x' + color.substring(1, 3)) / 255, parseInt('0x' + color.substring(3, 5)) / 255, parseInt('0x' + color.substring(5, 7)) / 255];
    var min, max, delta, h, s, l;
    var r = rgb[0],
      g = rgb[1],
      b = rgb[2];

    min = Math.min(r, Math.min(g, b));
    max = Math.max(r, Math.max(g, b));
    delta = max -...