Well, 
Have you looked at Qimage -
I tried it out a couple of times for printing images it's great. I did a mini-review of the trial (which was then limited in that the second printed page would have a grid superimposed - you had to restart)
Mini-Review here
Home-page http://www.ddisoftware.com/qimage/
If you only want to work with JPEGs it's $50 or $35 for a not so good version (limited interpolation method). To compare versions:-
http://www.ddisoftware.com/qimage/editions.htm
Enlarge Images Without Quality Loss doesnt exist as I'm sure you're fully awareQuote from: Bits du JourReshade Image Enlarger
- Resize Images Without Quality Loss

Have you looked at Qimage -
I tried it out a couple of times for printing images it's great. I did a mini-review of the trial (which was then limited in that the second printed page would have a grid superimposed - you had to restart)
Mini-Review here
Home-page http://www.ddisoftware.com/qimage/
If you only want to work with JPEGs it's $50 or $35 for a not so good version (limited interpolation method). To compare versions:-
http://www.ddisoftware.com/qimage/editions.htm





























