You can always access the actual image as bytearray from the
file reference. And then manipulate the bytearray to create a new
resized image.
Ex:
protected function init():void
var actualImage:ByteArray = new ByteArray();
actualImage = _fileReference.data as ByteArray;
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,byteImageLoaded);
loader.loadBytes(actualImage);
}
protected function byteImageLoaded(p_event:Event):void
{
//Explore alternative ways to create a Thumbnail
var sourceBMP:Bitmap = p_event.currentTarget.loader.content
as Bitmap;
//ur logic to resize the bitmap
}
Thanks