黑白图片滤镜

public static function grayFilter(param1:BitmapData):BitmapData
  {
   sourceBitmap = new Bitmap(param1);
   sourceBitmap.filters = [getGrayFilter()];
   returnBitmapData = new BitmapData(sourceBitmap.width, sourceBitmap.height, true, 16777215);
   returnBitmapData.draw(sourceBitmap);
   return returnBitmapData;
  }// end function
  
    
 Brightness -- 调25这个位置

   _loc_1 = [0.3, 0.59, 0.11, 0, 25,
    0.3, 0.59, 0.11, 0, 25,
    0.3, 0.59, 0.11, 0, 25,
    0, 0, 0, 1, 0];

    
  private static function getGrayFilter():*
  {
   var _loc_1:Array = null;
   var _loc_2:ColorMatrixFilter = null;
   
   ///*
   _loc_1 = [0.3, 0.59, 0.11, 0, 0,
         0.3, 0.59, 0.11, 0, 0,
         0.3, 0.59, 0.11, 0, 0,
         0, 0, 0, 1, 0];
      
   //*/
      
   _loc_2 = new ColorMatrixFilter(_loc_1);
   return _loc_2;
  }// end function
   
  
  private static function cleanValue(param1:Number, param2:Number) : Number
  {
   return Math.min(param2, Math.max(-param2, param1));
  }// end function

var bmpData_input:BitmapData = new BitmapData(
    Screen.width,
    Screen.height,
    true,
    4294967295);
   
   bmpData_input.draw(Screen);
   
   var bmpData_output:BitmapData = Filters.grayFilter(bmpData_input);
   
   var filters_bmp:Bitmap = new Bitmap(bmpData_output);