Source of the library

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/**
*
*  Javascript color conversion
*  http://www.webtoolkit.info/
*
**/
 
function HSV(h, s, v) {
 if (h <= 0) { h = 0; }
 if (s <= 0) { s = 0; }
 if (v <= 0) { v = 0; }
 
 if (h > 360) { h = 360; }
 if (s > 100) { s = 100; }
 if (v > 100) { v = 100; }
 
 this.h = h;
 this.s = s;
 this.v = v;
}
 
function RGB(r, g, b) {
 if (r <= 0) { r = 0; }
 if (g <= 0) { g = 0; }
 if (b <= 0) { b = 0; }
 
 if (r > 255) { r = 255; }
 if (g > 255) { g = 255; }
 if (b > 255) { b = 255; }
 
 this.r = r;
 this.g = g;
 this.b = b;
}
 
function CMYK(c, m, y, k) {
 if (c <= 0) { c = 0; }
 if (m <= 0) { m = 0; }
 if (y <= 0) { y = 0; }
 if (k <= 0) { k = 0; }
 
 if (c > 100) { c = 100; }
 if (m > 100) { m = 100; }
 if (y > 100) { y = 100; }
 if (k > 100) { k = 100; }
 
 this.c = c;
 this.m = m;
 this.y = y;
 this.k = k;
}
 
var ColorConverter = {
 
 _RGBtoHSV : function  (RGB) {
  var result = new HSV(0, 0, 0);
 
  r = RGB.r / 255;
  g = RGB.g / 255;
  b = RGB.b / 255;
 
  var minVal = Math.min(r, g, b);
  var maxVal = Math.max(r, g, b);
  var delta = maxVal - minVal;
 
  result.v = maxVal;
 
  if (delta == 0) {
   result.h = 0;
   result.s = 0;
  } else {
   result.s = delta / maxVal;
   var del_R = (((maxVal - r) / 6) + (delta / 2)) / delta;
   var del_G = (((maxVal - g) / 6) + (delta / 2)) / delta;
   var del_B = (((maxVal - b) / 6) + (delta / 2)) / delta;
 
   if (r == maxVal) { result.h = del_B - del_G; }
   else if (g == maxVal) { result.h = (1 / 3) + del_R - del_B; }
   else if (b == maxVal) { result.h = (2 / 3) + del_G - del_R; }
 
   if (result.h < 0) { result.h += 1; }
   if (result.h > 1) { result.h -= 1; }
  }
 
  result.h = Math.round(result.h * 360);
  result.s = Math.round(result.s * 100);
  result.v = Math.round(result.v * 100);
 
  return result;
 },
 
 _HSVtoRGB : function  (HSV) {
  var result = new RGB(0, 0, 0);
 
  var h = HSV.h / 360;
  var s = HSV.s / 100;
  var v = HSV.v / 100;
 
  if (s == 0) {
   result.r = v * 255;
   result.g = v * 255;
   result.v = v * 255;
  } else {
   var_h = h * 6;
   var_i = Math.floor(var_h);
   var_1 = v * (1 - s);
   var_2 = v * (1 - s * (var_h - var_i));
   var_3 = v * (1 - s * (1 - (var_h - var_i)));
 
   if (var_i == 0) {var_r = v; var_g = var_3; var_b = var_1}
   else if (var_i == 1) {var_r = var_2; var_g = v; var_b = var_1}
   else if (var_i == 2) {var_r = var_1; var_g = v; var_b = var_3}
   else if (var_i == 3) {var_r = var_1; var_g = var_2; var_b = v}
   else if (var_i == 4) {var_r = var_3; var_g = var_1; var_b = v}
   else {var_r = v; var_g = var_1; var_b = var_2};
 
   result.r = var_r * 255;
   result.g = var_g * 255;
   result.b = var_b * 255;
 
   result.r = Math.round(result.r);
   result.g = Math.round(result.g);
   result.b = Math.round(result.b);
  }
 
  return result;
 },
 
 _CMYKtoRGB : function (CMYK){
  var result = new RGB(0, 0, 0);
 
  c = CMYK.c / 100;
  m = CMYK.m / 100;
  y = CMYK.y / 100;
  k = CMYK.k / 100;
 
  result.r = 1 - Math.min( 1, c * ( 1 - k ) + k );
  result.g = 1 - Math.min( 1, m * ( 1 - k ) + k );
  result.b = 1 - Math.min( 1, y * ( 1 - k ) + k );
 
  result.r = Math.round( result.r * 255 );
  result.g = Math.round( result.g * 255 );
  result.b = Math.round( result.b * 255 );
 
  return result;
 },
 
 _RGBtoCMYK : function (RGB){
  var result = new CMYK(0, 0, 0, 0);
 
  r = RGB.r / 255;
  g = RGB.g / 255;
  b = RGB.b / 255;
 
  result.k = Math.min( 1 - r, 1 - g, 1 - b );
  result.c = ( 1 - r - result.k ) / ( 1 - result.k );
  result.m = ( 1 - g - result.k ) / ( 1 - result.k );
  result.y = ( 1 - b - result.k ) / ( 1 - result.k );
 
  result.c = Math.round( result.c * 100 );
  result.m = Math.round( result.m * 100 );
  result.y = Math.round( result.y * 100 );
  result.k = Math.round( result.k * 100 );
 
  return result;
 },
 
 toRGB : function (o) {
  if (o instanceof RGB) { return o; }
  if (o instanceof HSV) { return this._HSVtoRGB(o); }
  if (o instanceof CMYK) { return this._CMYKtoRGB(o); }
 },
 
 toHSV : function (o) {
  if (o instanceof HSV) { return o; }
  if (o instanceof RGB) { return this._RGBtoHSV(o); }
  if (o instanceof CMYK) { return this._RGBtoHSV(this._CMYKtoRGB(o)); }
 },
 
 toCMYK : function (o) {
  if (o instanceof CMYK) { return o; }
  if (o instanceof RGB) { return this._RGBtoCMYK(o); }
  if (o instanceof HSV) { return this._RGBtoCMYK(this._HSVtoRGB(o)); }
 }
 
}