diff --git a/lib/less/functions.js b/lib/less/functions.js
index 3e38d5eb..85189bfa 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -367,66 +367,6 @@ tree.functions = {
     _isa: function (n, Type) {
         return (n instanceof Type) ? tree.True : tree.False;
     },
-    
-    /* Blending modes */
-    
-    multiply: function(color1, color2) {
-        var r = color1.rgb[0] * color2.rgb[0] / 255;
-        var g = color1.rgb[1] * color2.rgb[1] / 255;
-        var b = color1.rgb[2] * color2.rgb[2] / 255;
-        return this.rgb(r, g, b);
-    },
-    screen: function(color1, color2) {
-        var r = 255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
-        var g = 255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
-        var b = 255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
-        return this.rgb(r, g, b);
-    },
-    overlay: function(color1, color2) {
-        var r = color1.rgb[0] < 128 ? 2 * color1.rgb[0] * color2.rgb[0] / 255 : 255 - 2 * (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255;
-        var g = color1.rgb[1] < 128 ? 2 * color1.rgb[1] * color2.rgb[1] / 255 : 255 - 2 * (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255;
-        var b = color1.rgb[2] < 128 ? 2 * color1.rgb[2] * color2.rgb[2] / 255 : 255 - 2 * (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255;
-        return this.rgb(r, g, b);
-    },
-    softlight: function(color1, color2) {
-        var t = color2.rgb[0] * color1.rgb[0] / 255;
-        var r = t + color1.rgb[0] * (255 - (255 - color1.rgb[0]) * (255 - color2.rgb[0]) / 255 - t) / 255;
-        t = color2.rgb[1] * color1.rgb[1] / 255;
-        var g = t + color1.rgb[1] * (255 - (255 - color1.rgb[1]) * (255 - color2.rgb[1]) / 255 - t) / 255;
-        t = color2.rgb[2] * color1.rgb[2] / 255;
-        var b = t + color1.rgb[2] * (255 - (255 - color1.rgb[2]) * (255 - color2.rgb[2]) / 255 - t) / 255;
-        return this.rgb(r, g, b);
-    },
-    hardlight: function(color1, color2) {
-        var r = color2.rgb[0] < 128 ? 2 * color2.rgb[0] * color1.rgb[0] / 255 : 255 - 2 * (255 - color2.rgb[0]) * (255 - color1.rgb[0]) / 255;
-        var g = color2.rgb[1] < 128 ? 2 * color2.rgb[1] * color1.rgb[1] / 255 : 255 - 2 * (255 - color2.rgb[1]) * (255 - color1.rgb[1]) / 255;
-        var b = color2.rgb[2] < 128 ? 2 * color2.rgb[2] * color1.rgb[2] / 255 : 255 - 2 * (255 - color2.rgb[2]) * (255 - color1.rgb[2]) / 255;
-        return this.rgb(r, g, b);
-    },
-    difference: function(color1, color2) {
-        var r = Math.abs(color1.rgb[0] - color2.rgb[0]);
-        var g = Math.abs(color1.rgb[1] - color2.rgb[1]);
-        var b = Math.abs(color1.rgb[2] - color2.rgb[2]);
-        return this.rgb(r, g, b);
-    },
-    exclusion: function(color1, color2) {
-        var r = color1.rgb[0] + color2.rgb[0] * (255 - color1.rgb[0] - color1.rgb[0]) / 255;
-        var g = color1.rgb[1] + color2.rgb[1] * (255 - color1.rgb[1] - color1.rgb[1]) / 255;
-        var b = color1.rgb[2] + color2.rgb[2] * (255 - color1.rgb[2] - color1.rgb[2]) / 255;
-        return this.rgb(r, g, b);
-    },
-    average: function(color1, color2) {
-        var r = (color1.rgb[0] + color2.rgb[0]) / 2;
-        var g = (color1.rgb[1] + color2.rgb[1]) / 2;
-        var b = (color1.rgb[2] + color2.rgb[2]) / 2;
-        return this.rgb(r, g, b);
-    },
-    negation: function(color1, color2) {
-        var r = 255 - Math.abs(255 - color2.rgb[0] - color1.rgb[0]);
-        var g = 255 - Math.abs(255 - color2.rgb[1] - color1.rgb[1]);
-        var b = 255 - Math.abs(255 - color2.rgb[2] - color1.rgb[2]);
-        return this.rgb(r, g, b);
-    },
     tint: function(color, amount) {
         return this.mix(this.rgb(255,255,255), color, amount);
     },
@@ -637,6 +577,85 @@ for(var i = 0; i < mathFunctions.length; i++) {
     tree.functions[mathFunctions[i].name] = createMathFunction(mathFunctions[i].name, mathFunctions[i].unit);
 }
 
+// Color Blending
+// ref: http://www.w3.org/TR/compositing-1
+
+function colorBlend(color1, color2, mode) {
+    var ab = color1.alpha, cb, // backdrop
+        as = color2.alpha, cs, // source
+        ar, cr, r = [];        // result
+        
+    ar = as + ab * (1 - as);
+    for (var i = 0; i < 3; i++) {
+        cb = color1.rgb[i] / 255;
+        cs = color2.rgb[i] / 255;
+        cr = mode(cb, cs);
+        if (ar > 0) {
+            cr = (as * cs + ab * (cb 
+                - as * (cb + cs - cr))) / ar;
+        }
+        r[i] = cr * 255;
+    }
+    
+    return new(tree.Color)(r, ar);
+}
+
+var colorBlendMode = {
+    multiply: function(cb, cs) {
+        return cb * cs;
+    },
+    screen: function(cb, cs) {
+        return cb + cs - cb * cs;
+    },   
+    overlay: function(cb, cs) {
+        cb *= 2;
+        return (cb <= 1)
+            ? colorBlendMode.multiply(cb, cs)
+            : colorBlendMode.screen(cb - 1, cs);
+    },
+    softlight: function(cb, cs) {
+        var d = 1, e = cb;
+        if (cs > 0.5) {
+            e = 1;
+            d = (cb > 0.25) ? Math.sqrt(cb)
+                : ((16 * cb - 12) * cb + 4) * cb;
+        }            
+        return cb - (1 - 2 * cs) * e * (d - cb);
+    },
+    hardlight: function(cb, cs) {
+        return colorBlendMode.overlay(cs, cb);
+    },
+    difference: function(cb, cs) {
+        return Math.abs(cb - cs);
+    },
+    exclusion: function(cb, cs) {
+        return cb + cs - 2 * cb * cs;
+    },
+
+    // non-w3c functions:
+    average: function(cb, cs) {
+        return (cb + cs) / 2;
+    },
+    negation: function(cb, cs) {
+        return 1 - Math.abs(cb + cs - 1);
+    }
+};
+
+function colorBlendInit() {
+    function f(m) {
+        return function(c1, c2) {
+            return colorBlend(c1, c2, m);
+        };
+    }
+
+    for (var m in colorBlendMode) {
+        tree.functions[m] = f(colorBlendMode[m]);
+    }
+
+} colorBlendInit();
+
+// ~ End of Color Blending
+
 function hsla(color) {
     return tree.functions.hsla(color.h, color.s, color.l, color.a);
 }
diff --git a/test/css/functions.css b/test/css/functions.css
index 9694a7a3..5c899072 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -126,7 +126,7 @@
   multiply: #ed0000;
   screen: #f600f6;
   overlay: #ed0000;
-  softlight: #ff0000;
+  softlight: #fa0000;
   hardlight: #0000ed;
   difference: #f600f6;
   exclusion: #f600f6;