This plug-in claims it can open jpeg file and render it better than photoshop:
http://www.betterjpeg.com/jpeg-plug-in.htm (scroll to the end of the page)
I'm surprised to see this claim. I always assume a jpeg file is rendered the same way by all apps.
Is their claim true? If so, why wouldn't adobe implement this as well?
Has a 30 day free trial. Download it, test it and let us know.