[Flashcoders] Resizing Bitmap - Preserving Alpha

[Karim Beyrouti]

Hi All - I have this code that resizes a bitmap, which works very well.
However - it does not preserve the alpha channel. I am not sure where  
i am going wrong:

 public static function resizeBitmap( originalBitmap : Bitmap ,  
scaleFactor : Number ) : BitmapData{

        var originalBitmapData:BitmapData=originalBitmap.bitmapData;

        var newWidth:Number=originalBitmapData.width*scaleFactor;
        var newHeight:Number=originalBitmapData.height*scaleFactor;
	var scaledBitmapData:BitmapData=new  
BitmapData(newWidth,newHeight,true,0xFFFFFFFF);
        
        var scaleMatrix:Matrix=new Matrix();
                scaleMatrix.scale(scaleFactor,scaleFactor);
                
        scaledBitmapData.draw(originalBitmapData , scaleMatrix);
        
        return scaledBitmapData;
        
 }

I am more than likely missing something obvious - so any clues would  
be very welcome...


Many kind regards


Karim 
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