HELP... after Mountain Lion and iPhoto software update. My library was updating and then corrupted

Question

Smooth update to ML and then ran software udate. It suggested I update iPhoto. I did that and then restarted computer and then tried to open iPhoto. It told me that it would update my library and not be able to go back to an earlier version. I clicked okay. Part way through an error window came up saying that my library was corrupted and that I need to go to a back up.  I have most on a back up, but not all. Can I trouble shoot this library or open the package and remove the most recent photos I need to my older back up?
Please advise - I really like the ML until this happened.

Answer 1

Option 1
Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Choose to Repair Database. If that doesn't help, then try again, this time using Rebuild Database.
If that fails:
Option 2
Download iPhoto Library Manager and use its rebuild function. This will create a new library based on data in the albumdata.xml file. Not everything will be brought over - no slideshows, books or calendars, for instance - but it should get all your albums and keywords back.
Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
Regards
TD