Double disk usage?

I have purchased the Gemini app from the Apple store and that is now going through the process of finding the duplicated images within Iphoto and deleting them

I hope you made a backup copy of your library before running Gemini on it? Because it's an app from MacPaw which gives us CleanMyMac2, one of the most destructive malware apps out there. Personally I wouldn't touch Gemini with a 20 foot pole. Do a search for CleanMyMac2 here in the forums and you'll find literally hundreds of topics on how it damaged their system and software. There are good duplicate finders out there for iPhoto so if you're still in need of one post back and I'll give you a list.

Old Toad - Thank you for your words of wisdom. Given that I bought the software from Apple I assumed that Gemini was a legitimate product. If you could advise of what will help solve this duplicate problem in iphoto I would certainly appreciate it (Another helpful friend told me this afternoon that iphoto is due to be upgraded imminently top ios photos so it is academic for me to inquest as to how my image library got replicated 4 fold). Thanking you in anticipation. Nige

Apple can't test every app submitted and anything from MacPaw in my book is off limits.

Even if you migrate to the new Photos application you will need to cull out the duplicates from your existing library as it's used to create the new library.

I have rebuilt the library which has shown for reasons I do not know that there are multiple copies in Iphoto

Where are you seeing these duplicates? In the iPhoto window or via the Finder?

As for removing duplicates these applications will identify and help remove duplicate photos from an iPhoto Library:

iPhoto Library Manager - $29.95

PhotoSweeper - $9.95 - This app can search by comparing the image's bitmaps or histograms thus finding duplicates with different file names and dates.

Duplicate Annihilator - $7.95 - only app able to detect duplicate thumbnail files or faces files when an iPhoto 8 or earlier library has been imported the library.

DeCloner - $19.95 - can find duplicates in iPhoto Libraries or in folders on the HD.

DupliFinder - $7 - shows which events the photos are in.

iPhoto AppleScript to Remove Duplicates - Free

PhotoDedupo - $4.99 (App Store) - this app has a "similar" search feature which is like PhotoSweeper's bitmap comparison. It found all duplicates

Duplicate Cleaner for iPhoto - free - was able to recognize the duplicated HDR and normal files from an iPhone shooting in HDR

Some users have reported that PhotoSweeper did the best in finding all of the dups in their library: iphoto has duplicated many photos, how...: Apple Support Communities.

If you have an iPhone and have it set to keep the normal photo when shooting HDR photos the two image files that are created will be duplicates in a manner of speaking (same image) but there are only twp apps that detected the iPhone HDR and normal photos as being duplicates: PhotoSweeper and Duplicate Cleaner for iPhoto. None of the other apps detected those two files as being duplicates as they look for file name as well as other attributes and the two files from the iPhone have different file names.

iPLM, however, is the best all around iPhoto utility as it can do so much more than just find duplicates. IMO it's a must have tool if using iPhoto. It's rumored that it's is being ported over to work with Photos libraries.