public function @ax-graphic-flex-image-effects-02-Flex-BlendModeFunctions() {
                          // the colors of the top and bottom pixel to test
                          var topPixel:Object = {red:0xFF, green:0x33, blue:0x99};
                          var bottomPixel:Object = {red:0x00, green:0x00, blue:0x99};
                          // the method to apply
                          var method:String = "difference";
  
                          // finds the new value for each channel based on the top and bottom
                          // pixels and blend mode that was applied
                          var red:Number = this[method](topPixel.red, bottomPixel.red);
                          var green:Number = this[method](topPixel.green, bottomPixel.green);
                          var blue:Number = this[method](topPixel.blue, bottomPixel.blue);
                          // traces out the resulting pixel value
                          var resultPixel:uint = (red << 16) | (green << 8) | (blue);
                          trace(resultPixel.toString(16));
                  }
  
                  public function normal(topPixel:uint, bottomPixel:uint):uint {
                          return topPixel;
                  }
  
                  public function multiply(topPixel:uint, bottomPixel:uint):uint {
                          return (bottomPixel * topPixel)/255;
                  }
  
                  public function screen(topPixel:uint, bottomPixel:uint):uint {
                          return (255 - ((255 - topPixel) * (255 - bottomPixel))/255);
                  }
  
                  public function hardlight(topPixel:uint, bottomPixel:uint):uint {
                          var color:uint;
                          if (topPixel > 127.5) {
                                  color = screen(bottomPixel, 2 * topPixel - 255);
                          } else {
                                  color = multiply(bottomPixel, 2 * topPixel);
                          }
                          return color;
                  }
  
                  public function overlay(topPixel:uint, bottomPixel:uint):uint {
                          return hardlight(bottomPixel, topPixel);
                  }
  
                  public function add(topPixel:uint, bottomPixel:uint):uint {
                          return Math.min(255, bottomPixel + topPixel);
                  }
  
                  public function subtract(topPixel:uint, bottomPixel:uint):uint {
                          return Math.max(0, bottomPixel - topPixel);
                  }
  
                  public function lighten(topPixel:uint, bottomPixel:uint):uint {
                          return Math.max(topPixel, bottomPixel);
                  }
  
                  public function darken(topPixel:uint, bottomPixel:uint):uint {
                          return Math.min(topPixel, bottomPixel);
                  }
  
                  public function difference(topPixel:uint, bottomPixel:uint):uint {
                          return Math.abs(topPixel - bottomPixel);
                  }
  
                  public function invert(topPixel:uint, bottomPixel:uint):uint {
                          return (255 - bottomPixel);
                  }
  
          }
  
  }