Hiya Baron,
this is how SuperDuper should normally recover via image file:
QUOTE
If you have a backup image or volume, but can't start up from it, you can
still restore using your OS X install disc. To do so:
- Start up from the OS X Install disc.
- When the Installer starts, choose "Disk Utility" from its Application
menu.
- Once the Disk Utility starts, select the drive you want to restore to,
and switch to the Restore tab.
Note
If you're restoring from a sparse image,
first open the image by choosing File > Open Image... in Disk
Utility. Then, use the volume that appears as
the source.
- Follow the instructions on the Restore tab: the backup created by
SuperDuper is fully compatible with Disk Utility's Restore function.
- Once the backup has been restored, restart your computer with Option
held down, and select it as your startup volume.
Recovery accomplished!
I think the trick is to first mount the image file before restoring to your OSX partition.
Hope this helps,
hecker