Just checked out the link you gave me. The first picture was a perfect example of the resize algorithm sucking ass. The line between the G20 hood (on the roof) and the windshield clearly shows the problem. I'm not sure why you thought your plug-in was any different?
Should I post the Mercedes SLS picture on your forum to see how badly it butchers it?
Original:
http://www.utahnissans.com/primerapics/DSCF1537.JPG
Resized by shitty forum algorithm.
Resized by typical, decent algorithm.
Clear difference.