Finding new width and height after applying blur filter

1

How???


            trace(drawer.width);
            drawer.filters[cloudBlurFilter];
            trace(drawer.width);
            var temp:BitmapData=new BitmapData(drawer.width, drawer.height, true,0 );
            temp.draw(drawer, idMatrix);
            trace(temp.width);
            temp.applyFilter(temp,new Rectangle(0,0, temp.width, temp.height), origin, cloudBlurFilter);
            trace(temp.width);

Trace output still the same both before and after applying filter for either Sprite or BitmapData. The width and height still remains the same.
64
64
103.80000000000001
103.80000000000001
103
103
36.75
36.75
36
36
82.7
82.7

Help!