Flex :: Get Dimension Of Locally Loaded Large Image?

I'm trying to read the width and height of a locally loaded image. This seems to work for images that do not exceed the dimensions limited by the Flash Player 10 [URL], but as soon as the images are bigger, the width and height remain 0. The strange thing is that now and then, I can read the dimension of these bigger images, but most of the times not. I understand that this might be because of the player limitation, but then I would at least expect the error to be consistent.

I want to check this since there is no use in loading such a big image as it will not be displayed anyway, but it would be good to provide a detailed error message to the user.

Here's the code that I use to load the image locally and read the dimension:

private function chooseImageButton_clickHandler(event:Event):void {
var allowedTypes:String = "*.jpg;*.png";
m_uploadFileReference = new FileReference();
m_uploadFileReference.addEventListener(Event.SELECT,

[Code].....