Trace stretched bitmapdata

What I am doing is simply putting an image in a mc (let’s say mcImage) and I stretch the mc to 200% width wise. Now I create bitmapData from the stretched mc (mcImage) but the bitmapData that flash generates looks like the normal size and not the stretched size.

I tried a couple of other things like putting the mcImage in a mc and then putting the mc again in another mc (mainMC -> mcImage -> image) and I stretch the mcImage and then I create bitmatData from mainMC which works fine. But what I need is to trace tge image as it is without putting the imageMC in another mc (mcImage -> image).

Can anyone help me with this?