en javascript?

j'ai trouvé ca sur http://javascriptfr.com/code.aspx?ID=17130(...) en cherchant rgb2hsl via mon ami google :)

/ JScript source code
//Red : 0..255
//Green : 0..255
//Blue : 0..255
//Hue : 0,0..360,0<=>0..255
//Lum : 0,0..1,0<=>0..255
//Sat : 0,0..1,0<=>0..255
//Retourne un tableau de 3 valeurs : H,S,L
function RGB2HSL (r, g, b)
{
 red = Math.round (r);
 green = Math.round (g);
 blue = Math.round (b);
 var minval = Math.min (red, Math.min (green, blue));
 var maxval = Math.max (red, Math.max (green, blue));
 var mdiff = maxval - minval + 0.0;
 var msum = maxval + minval + 0.0;
 var luminance = msum / 510.0;
 var saturation;
 var hue;
 if (maxval == minval)
 {
 saturation = 0.0;
 hue = 0.0;
 }
 else
 {
 var rnorm = (maxval - red) / mdiff;
 var gnorm = (maxval - green) / mdiff;
 var bnorm = (maxval - blue) / mdiff;
 saturation = (luminance <= 0.5) ? (mdiff / msum) : (mdiff / (510.0 - msum));
 if (red == maxval)
 hue = 60.0 * (6.0 + bnorm - gnorm);
 if (green == maxval)
 hue = 60.0 * (2.0 + rnorm - bnorm);
 if (blue == maxval)
 hue = 60.0 * (4.0 + gnorm - rnorm);
 if (hue > 360.0)
 hue -= 360.0;
 }
 return new Array (Math.round (hue * 255.0 / 360.0), Math.round (saturation * 255.0), Math.round (luminance * 255.0));
}
function Magic (rm1, rm2, rh)
{
 var retval = rm1;
 if (rh > 360.0)
 rh -= 360.0;
 if (rh < 0.0)
 rh += 360.0;
 if (rh < 60.0)
 retval = rm1 + (rm2 - rm1) * rh / 60.0;
 else if (rh < 180.0)
 retval = rm2;
 else if (rh < 240.0)
 retval = rm1 + (rm2 - rm1) * (240.0 - rh) / 60.0;
 return Math.round (retval * 255);
}
//Retourne un tableau de 3 valeurs : R,G,B
function HSL2RGB (h, s, l)
{
 var hue = h * 360.0 / 255.0;
 var saturation = s / 255.0;
 var luminance = l / 255.0;
 var red;
 var green;
 var blue;
 if (saturation == 0.0)
 {
 red = green = blue = Math.round (luminance * 255.0);
 }
 else
 {
 var rm1;
 var rm2;
 if (luminance <= 0.5)
 rm2 = luminance + luminance * saturation;
 else
 rm2 = luminance + saturation - luminance * saturation;
 rm1 = 2.0 * luminance - rm2;
 red = Magic (rm1, rm2, hue + 120.0);
 green = Magic (rm1, rm2, hue);
 blue = Magic (rm1, rm2, hue - 120.0);
 }
 return new Array (red, green, blue);
}