【转】一个将image转化为“黑白灰度”图像的函数

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private function convertToGrayscale(image:DisplayObject):void 
    { 
      var matrix:Array = [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]; 
      var grayscaleFilter:ColorMatrixFilter = new ColorMatrixFilter(matrix); 
      var filters:Array = image.filters; 
      filters.push(grayscaleFilter); 
      image.filters = filters; 
    }