Hello,
If you're using iPhoto 7 (iLife '08), duplicates are detected and are not imported by default.
However, if you have chosen to import the duplicates, you have some duplicates photos in your iPhoto library.
At this point, I can imagine 2 kinds of solutions :
- Use a 3rd app like "Duplicate Annihilator" :
http://www.brattoo.com/propaganda/index.php?action=software
- Copy your photo files outside iPhoto library,
remove every photo from your iPhoto library,
import your photo files (previously copied) into your "clean" iPhoto library (album after album) taking care you do not chose to import duplicate
I never used any of these solutions, so be very careful (if you can, make a copy of your disk with CCC before any modification)...