We quickly moving to era where what you see is far from reality. Microsoft Research based in Bejing demonstrated similar techniques about 2 years ago.
Be afraid, very afraid. Interestingly enough forensics don't have methods yet to determine if image has been manipulated since it's such a new area. You can only hope that someone doesn't decide you are the 'less significant' area.... :D
New method to shrink images — Two Israeli professors, Shai Avidan and Ariel Shamir, have demonstrated a new method to shrink images. The method figures out which parts of an image are less significant, and then makes it possible to change the aspect ratio of an image without make it look skewed. More info after the jump.