IPhoto 9.3 Rebuild/Updating Thumbnails

Hi there,
So I'm on a MacBook Pro, Late 2008 with OSX Lion, and recently did a software update that included the 9.3 version for iPhoto. I plugged in my Nikon D5100 yesterday to get import photos into my iPhoto library when a message popped up that said: "The photo library needs to be upgraded to work with this version of iPhoto. Your photo library will not be readable by previous version of iPhoto after the upgrade. The upgrade process for very large libraries may take an hour or more to complete."
After contemplating for about a day, I talked to a friend who had a similar problem, he did a rebuild on his library and got his photos back with no problem.
I have a library with about 20,000 photos and numerous videos. I've never backed up my MB so I don't have a backup for my photos or anything of that sort.
I took the plunge because my friend was confident in it and I did the upgrade. I did the whole rebuilding database process and I thought it was fine since I saw all my albums afterwards. I didn't see thumbnails, so I asked him what I should do. He suggested I restart my computer. Restarted my computer, opened iPhoto back up and it started the "Updating Thumbnail" process. It was going okay until it got just a little over the halfway mark on the progress bar. It has been stuck in that same spot for about 2 hours now. Am I just being impatient about it or does it really take that long to update the thumbnails? WOuld having a lot of videos in iPhoto hinder the process at all?
Before asking this question I researched the community questions quite thoroughly so I didn't ask a question that could already have a solution that I need, however, I still couldn't find quite the right question or answer for my problem, hence my asking. I'm a little worried that since I don't have a backup hard drive that I'll lose my photos if I Force Quit iPhoto, especially when it says that it's still running and responsive. I tried clicking on "Finish Later" but it now seems like iPhoto is completely frozen up and I'm really not sure what to do about it. I'm just hoping I don't lose five years worth of photos because of one of Apple's mistakes. Also, I do have an external hard drive coming my way so I will have a way to back up my photos for the future. Any suggestions are helpful! Thanks!
Catherine

first - not having a backup is a terrible user mistake - people, computers and software fails and a backup is the only way to protect your files and photos - if you do not have a good, crrent backup you are 100% guarenteed to lose your file sincluding your photos sooner or later - not haveing a backup is playing Russian Roulette with yoru information
As to rebuilding thumbnails - yes it can take a while
At this stage since you choose to not make backups your choices are to wait and hope - if things do not work out you can backup what you have and try rebuilding the library (depress the option and command keys and launch iPhoto) - if nothing works you will have to start over with th eoriginals and possibly with photos recovered with expensive file recovery software
LN

Similar Messages

Iphoto keeps asking to update thumbnails - EACH TIME

iPhoto iphoto keeps asking to update thumbnails - EACH TIME. I've told it ignore 5 times, and each sessions involves about 100 photos and 2 horus of clicking no - help!
Where is the file that I can update?
Thanks
George

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. (In Library Manager it's the FIle -> Rebuild command)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places 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

IPhoto: strange behaviour with preview thumbnails

Is there a simple way in iPhoto 8 to rebuild the thumbnail database?
I recently noticed a strange behaviour iPhoto 8 has with previews: In some of my event categories, iPhoto does not display the correct preview thumbnail of the picture, but a preview thumbnail of another event. When I click on the thumbnail, it reloads the appropriate preview and it does not happen again - with that picture. Also, if I double click an event to open it, the small thumbnail of the event's key photo that is to be displayed in the title bar (next to the All Events button) is not always correct.
Thank you for your help!
Stefan

I have similar problems (lately) with iPhoto 6.0.6 -- thumbnails do not equal the images they 'thumbnail' of.
Sometimes when it opens, it (recently) asked me to rebuild the thumbnails, but not always.
Can I force a thumbnail rebuild using the command you gave - Apple-option while opening iPhoto? In iPhoto 6.0.6 this primarily forces a new selection of a library.

Attempts to rebuild thumbnails did not work. How do I get rid of message "Updating thumbnails" every time I open iPhoto?

After repairing and rebuilding the iPhoto libary/database, I attempted to rebuild the thumbnails on an older Mac Book (10.7.5) and iPhoto 9.0. I believe there was not enough disk space for this function. Now when I open iPhoto, I get the message "Updating thumbnails." I then need to hit "cancel" to open iPhoto, How can I get rid of the "Updating thmbnails" message?

Basically none.
That is the problem
you need a minimum of 10GB of free space just for normal os - with little or none y0u risk damaging yoru iPhoto database and other important system components - you must make space immediately
Exporting photos is not the solution - unless you can delete some large files that are not needed The fastest way is to purchase an external hard drive formatted Mac OS extended and move your iPhtoo library to it -
Moving the iPhoto library is safe and simple - quit iPhoto and drag the iPhoto library intact as a single entity to the external drive - depress the option key and launch iPhoto using the "select library" option to point to the new location on the external drive - fully test it and then trash the old library on the internal drive (test one more time prior to emptying the trash)
And be sure that the External drive is formatted Mac OS extended (journaled) (iPhoto does not work with drives with other formats) and that it is always available prior to launching iPhoto
And backup soon and often - having your iPhoto library on an external drive is not a backup and if you are using Time Machine you need to check and be sure that TM is backing up your external drive
I would not put my iphoto library on a flash drive - and usually they are not formated correctly wso will nto even work
LN

Updating Thumbnails... each time I open iPhoto

Hello-
Every time I open iPhoto, it updates the thumbnails. I have tried the following to no avail:
1) Remove the iPhoto preferences from home/library/preferences,
2) Remove the iPhoto cache from home/library/Caches/com.apple.iPhoto
3) Rebuild the Thumbnails (command-option while opening iPhoto)
4) Repair permissions (command-option while opening iPhoto)
5) Repair database (command-option while opening iPhoto)
Please let me know if you have encountered this and what you did to fix it. Thank you.

I'm experiencing the same issue with iPhoto 9.3. I rebuild the library using each of the four option (only one can be used at a time with iPhoto 9.3)
with no success. It was the only library of my 15 libraries that exhibited this issue. Lastly I rebuild the library with iPhoto Library Manager and iPLM crashed. Evidently that one library is damaged in such amanner that It can't be rebuilt by iPLM nor merged into an new library. iPLM crashes with the following mesage:
This is the console message I get each time iPLM fails to merge the library:
06/15/12 4:42:25.950 PM iPhoto Library Manager: *** Assertion failure in -[AUAppleEvent sendWithMode:timeout:], /Volumes/Ratbert/Users/bwebster/Projects/UberProject/CarbonUtils/AUAppleEvent.m :372
06/15/12 4:42:34.153 PM Console: ISGetIconFamilyFromStorage: seed mismatch for 2c510003, actual seed is 625558ec
I have no idea what it means. I imported the Masters folder from the problem library into a new library. There were 15 files that could not be imported although they were formats that iPhoto does recognize, jpg, psd and CR2.
Go figure.
OT

IPhoto doesn't rebuild thumbnails

Hi there.
I had to format my macbook pro and installed everything again. As usual i backup my iphoto library so that i can take it to the new system. this time, and after all iphoto updates, i've opened the application and it doesn't display any thumbnails, even after rebuildind it.
help!

Are you running File Vault?
__This can cause interesting issues with files and file permissions. If you have it turned on, consider backing up your computer and turning File Vault off.
How much available space do you have on your hard drive?
--Click on the Finder icon (little blue on blue smiley face in the dock) and look at the bottom of the windows that appears. If your available space is less than 10 GB this can impact performance on the computer (I like 20 GB free myself).
<hr>
If doing several thumbnail rebuilds as TD suggests does not resolve the issue you can try manually rebuilding the thumbnails.
__NOTE: Make sure you have a back up of your iPhoto Library before you do this as it requires modifying the contents of the iPhoto Library which can cause permanent damage to the Library if done incorrectly.
Manually rebuilding the thumbnails in iPhoto:
__Quit iPhoto if it is open
__Right click or ctrl click on the iPhoto Library in question.
__Choose Show Package contents
__Remove the following files to the trash:
_Data
_Data.noindex
_Thumb64Segment.data
_ThumbJPGSegment.data
__Launch iPhoto while hold down command and option on the keyboard
__Choose the top 2 options rebuild all thumbnails

Can't use iPhoto/updating thumbnails/original can't be found

I haven't used iPhoto in a long time, and have rarely ever used it, have always found it counterintuitive and unnecessarily difficult. The last time i used it was probably in the past 6 months and it worked OK. Today i'm having a new problem that i can't fix, hoping someone more knowledgeable can help me.
I opened iPhoto because i was going to try using iCloud for storing photos. The "beta" iCloud Photos opened and said that i would have to turn on Photo Library on my iPhone. I looked at that and it said "automatically upload and store your entire photo library in iCloud to access photos and videos from all your devices."
I'm not sure i want to do that, i don't want all my storage used up. I googled "Can i store selected photos on iCloud photos," to see if i can choose which photos in my photo library i want to put on the cloud. I got a link to an Apple Support page which was titled My Photo Stream FAQ. I was reading the beginning of it and it said i needed to have iPhoto v.9.2 or greater. So, i clicked on the iPhoto icon in the doc to open it and see the version number that way.
That was the beginning of the trouble.
I can't remember the whole sequence of what happened, but at the beginning, i got a message window telling me that there were problems with my data directory, it didn't use those terms but something about inconsistencies between different things which it said could cause problems, and one of the options was a button that said Repair. So i clicked on Repair.
Then i got a small window with a progress bar that said Updating Thumbnails. Pretty soon after that, i got another window, a message window that said something like "Alert - The photo “IMG_9673.JPG” could not be opened, because the original item cannot be found." The two options were Cancel or Find Photo. I clicked on Find Photo, a window opened with a field to type the name of the photo but iPhoto had taken the window away that had the file name, so i had to close out and wait for the window to come back. Then i memorized the obscure file name and put it in the search field after clicking Find Photo. Nothing happened. Nothing was found or not found, there was no response and no button to click on. there was no way to use that window to search with. There was a grayed out "open" button. What a waste of time. This is why i don't use iPhoto.
So, then i used the Finder Find file window and typed in IMG_ because there were a lot of them, not just a few, so i wanted to find out where they all were and maybe i could just delete them. Find file showed that a lot of them were in Mail, apparently mail attachments, and there was a total of over 4700 of them. So, there was no way i was going to be able to click Cancel 4700+ times, this was a very slow process, each time, there was an extended pause until the next window with 'cancel' came up, and of course, it would be too easy to have an option to apply the choice to all. That didn't exist. I couldn't do anything functional with iPhoto, everything was grayed out, including Quit. I used force quit.
i tried restarting iPhoto, the same thing happens, i got the same 'updating thumbnails' and 'Alert - original cannot be found'. One time, i got the original "you have inconsistencies" message and the options to repair or or cancel, and i chose cancel this time, but it still brought up the Updating Thumbnails/Alert - can't be found' windows.
Each time, i force quit.
Is there anything i can do? i don't want to reinstall the whole system. Is there something somewhere i can throw in the trash? I do not want to have to reinstall the system software for a program i rarely if ever use because i find it so difficult.

Terence--thank you for the reply. To my knowledge i haven't ever done anything with iPhoto preferences to change it from the default. i have very rarely used iPhoto because i have found the interface difficult and awkward. Because i use it so little, i would've had no reason to change the preferences that i can remember. i certainly would not have known anything about the options you describe and would not have selected a Referenced Library because i don't know where else i would put the photos. I have been managing my photos on the iPhone for the past 5 or 6 years, and before that, i used a Canon photo management program. i mostly store my photos on the phone but i email photos to my computer in order to post them on facebook etc, before that became easier to do from the phone . i would edit photos in Preview or on the phone. I have barely used iPhoto. i think occasionally, i sync the phone photos with the computer as a back up. That would account for there being a lot of photos in the iPhoto Library, maybe. As far as i know, i have the default settings on iPhoto.
I used iPhoto a couple of times in the past year, to find some old photos, and the program opened normally. Today, it did not open normally but gave me the message about having some inconsistencies and asking if i wanted to repair them, which then led to the Updating Thumbnails window, which then led to the Alert - The photo could not be opened because the original could not be found message window. Nothing else opens. There is no functional iPhoto at this point. I can either open it and look at a screen with those messages on it, or i can force quit it. I can't check the preferences settings, not from within the program.
I searched for the IMG_ files and found about 3000 of them and put them in a photo on my desk top. Does that mean they are in a Referenced Library?
Do you know of any way of getting this 'updating thumbnails' process to stop?
There was a time when dragging a plist file to the desk top or the trash could help to fix problems, and i was hoping there would be something like that i could do. i don't know what changed since the last time i opened iPhoto that has caused this problem that i have not had before. Maybe it was after the change from Snow Leopard to Mountain Lion. I can't remember.

My computer just had to get a new hard drive and we reloading info onto the new hard drive...my iphoto pics are all, there save about 8, but there are NO thumbnails. I tried rebuilding the thumbnails...nothing. I tried creating a new library...nothing.

I have recently had to purchase a new battery and hard drive. Because it wouldn't back up completely, I was able to recover most information, but it looked a bit different or I have found items in different places. One thing that is happening is in iphoto. All my pics are there, but there are NO thumbnails visible. I have tried rebuilding the thumbnails...nothing. I have tried creating a new library...no info even transferred. Any suggestions?

What version of iPhoto?
Can you view the pics at full size?

What is updating thumbnails in iphoto

my iphoto says "updating thumbnails" and continuously asks me if I want to find a photo because the original is missing..??

Updating thumbnails means that iPhoto is updateing the thumbnails
what version of iPhoto do you have?
What is the exact error message you are getting
in the iPhoto preferences is sthe preference to "copy imported items to the iPhoto library" checked or have yoou unchecked it?
LN

Diskspace decreases when updating thumbnails in iPhoto?

I recently had a problem with iPhoto showing the same thumbnails on multiple images. I cleared the issue by updating the thumbnails. But by doing that my internal drives free space dramatically decreased, down to below 1 GB of free space! And I had to stop updating thumbnails.
I have my iphoto library on an external drive, and assumed that all databses and thumbnails was stored inside that package, isn't that right? and if so, why is space decreasing on the internal drive instead of the external? Should it decrease at all?
My son has a very tiny iPhoto library on the internal drive (approx. 300MB) could that somehow have tricked iPhoto in to believing that my library is also internally stored?
I hope someone can help me answer my questions, so I can get my space back:)
Thanks in advance!
Kind regards,
Thomas Detlefsen

down to below 1 GB of free space!
You have a big problem and you need to fix it fast. Very fast.
OS X needs about 10 gigs of hard drive space for normal OS operations - things like virtual memory, temporary files and so on.
Without this space your Mac will slow down as the OS hunts for space on the disk, files will be fragmented, also slowing things down, apps will crash and the risk of data corruption - that is damage to your files, photos, music - increases exponentially.
Your first priority is to make more space on that HD. Nothing else can be done until you do.
It's most likely that the space on your internal is eaten by temporary files. But it doesn't matter a whit. Your are in grave danger of serious dataloss.

IPhoto Crashes during Upgrade at Thumbnails

I have searched this discussion group and found many suggestions to overcome my problem with iPhoto 5.0.4, but none are working.
I installed iLife '05 yesterday. My entire purpose in purchasing this software was to organize my extensive photo library. When going through the upgrade process, iPhoto crashes while updating Thumbnails.
I have tried this suggestion:
Setting Permissions for iPhoto Library Folder
1 - Select the iPhoto Library folder and type Command-I.
2 - When the Info window comes up go to the Ownership and Permissions section and make sure You have Read & Write permission and that the Owner and Group have Read & Write also. Others - Read Only.
3 - Then click on the "Apply to enclosed items..." button.
See it it will work now. If not, launch iPhoto with the Command+Option keys depressed and follow the instructions to rebuild the library. Select the two options regarding thumbnails. This may be the same as what iPhoto was doing on its own but give it a try. if that fails then move the three thumbnail files, Thumb32.data, Thumb64.data and ThumbJPG.data to the Trash and launch iPhoto. They may be damaged and rebuilding this way may get you thru the process.
I have tried the suggestions on these pages:
http://homepage.mac.com/loridilo/Personal21.html
http://homepage.mac.com/loridilo/Personal22.html
NOTHING works. I know my photos are not lost and that they are on my hard drive. However, if I have to recreate the hundreds of folders I'm gonna go postal.
-Kirk

Kirk:
Do you have a backup copy of your V4 iPhoto Library folder? After installing iLife 05 did you repair disk permissions with Disk Utility?
Here's an easy off the wall fix that worked for another user, it just might work for you.
1 - move your iPhoto Library folder to the desktop.
2 - launch iPhoto and when asked create a new library.
3 - quit iPhoto and move the new library folder to the trash and move the original one back to the Pictures folder.
4 - launch iPhoto.
Don't ask me why but it worked for another user.
If that doesn't work you can try to rebuild the library (make a temporary backup copy of the library folder first - select it and type Command-D. Then launch iPhoto with the Command+Option keys depressed and follow the instructions to rebuild the library. Select the first three options.
If that doesn't work there's this option:
1 - move the backup library folder to the desktop and trash the original that didn't rebuild properly.
2 - launch iPhoto and create a new library.
3 - using the File->Add to Library select the duplicate library folder and click the Import button.
This will import the full sized image files that are inside that iPhoto Library folder. Most of the rolls will be intact but with different titles and dates (the current import date). There will be additional rolls for the various original files of those you've edited earlier. You will lose albums, keywords and comments. But that should get you an up and running library.
Hope this has been of some help. Good luck.
OT

Photo corruption post iPhoto 6.0.5 update

Recently downloaded iPhoto 6.0.5 update via software update and multiple photos in the library appear to be corrupted or have a portion missing. Some but not all of these photos have been modified and appear fine in the "Original" folder and in their thumbnail view but appear corrupted in the full screen view. By corrupted, I mean that a portion of the photo from the top down to a certain point appears as it should and then objects in the photo are shifted, color distorted, and sometimes overwritten with colorful vertical bands from that point down. In slideshow view, these pictures are all black. I have backup copies of the originals but can't work on any of the current projects without encountering these problems.
Is it possible to remove the 6.0.5 update if it is, indeed, the cause? Thanks
mac mini (Intel 1.66 GHz Core Duo) Mac OS X (10.4.7) Base model: 1.66 Intel Core Duo, 512 Ram, Combo Drive, 60 GB HD - external FW HD, recent software update to OSX 10.2.8, iphoto 6.0.5

I tried the instructions to rebuild the iPhoto library. Not knowing exactly what the problem was, I checked all the boxes to rebuild all thumbnails, find orphans, etc. The process executed in less than 10 seconds. Now, iPhoto only shows 6 photos in my library (there were several hundred before). One has the colors all messed up in certain parts of the photo, one is about 3/4 of the picture and the bottom 1/4 is blank, one only appears as a grey, dashed outline, and 3 appear as they should until I try to view them full screen and I get an infinite rolling beach ball.
To answer your question, TD, when using Finder to navigate to my iPhoto library and opening jpgs from the "Modified" folder, the files appear incomplete. Some are normal and continuous from the top down to a certain point - a different point in each file - where they go blank from there down. Others appear completely black in Preview. Still others appear completely normal, as they should. Even the jpgs that show as normal in Preview, however, no longer appear in my library when I open iPhoto.
The beach ball started rolling before I started this post. Its still rolling...
mac mini (Intel 1.66 GHz Core Duo) Mac OS X (10.4.7) Base model: 1.66 Intel Core Duo, 512 Ram, Combo Drive, 60 GB HD - external FW HD, recent software update to OSX 10.2.8, iphoto 6.0.5

Iphoto 9.2.3 - updated then lost 3/4 of the images!

I am using Mac OSX 10.7.3 and iphoto 9.2.3.
Having recently updated my desktop, I was using iphoto when i found under 'events' that 3/4 of the event folders where shown as black suares i.e no image on the event. The events still have the titles and when I enter an event some of the images are visible to me others are again blacked out until I click on the single image itself. It seems that iphoto is only showing images taken either using my iphone4 or using Nikon D300. Other images (which are the blacked out squares I speak of) were taken using different cameras.
I have no idea where to start to restore the library back to how it was with everything visible again.
I do have a back up hard drive but am not that techie to know what to do here.
I would be very grateful of any assistance
Thank you in advance folks
Maria

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. Include the option to rebuild the thumbnails. It can take 3 or 4 goes for this to work

Updating thumbnails can't find original

Every time i launch iPhoto 11 (after i connect iPhone), and the updating thumbnail process initiates, iPhoto stalls saying it can't find about ~20 original photos. It the same ~20 photos everytime. Tried repairing database. No change.

I did try iPhoto Library Manager before posting here, but it told me it couldn't rebuild the database because it was corrupt! Yikes.
Okay, so I did what someone suggested on another thread, and tried to identify all the 80 or so photos that were supposedly 'missing'. I wrote down the name of every photo on a text edit doc.
Then I did something strange that seems to have worked: I went to Spotlight, and searched for one of the image names. I found it inside the iPhoto library. (I'm not sure why you can't navigate to photos from inside iPhoto, but you can from Spotlight - note, you can't find them in any other finder window, just Spotlight).
I dragged the culprit file to my desktop. Then, when the alert came up again, I used File > Reveal in Finder to navigate to the photo...interestingly, iPhoto then pointed to the original location of the missing file...I then dragged the photo from my desktop back into iPhoto's library via the Finder. Voila, the photo was re-linked.
But here's where it gets interesting. Somehow other photos got re-linked, too!
I quit the program, and the same problem reoccurred. So I took the steps again above, but this time I did something slightly different afterward.
I went to the TextEdit doc, and I found each and every photo, and dragged it into an album I'd created (I called it something like "Photos to Fix" or something). I then went to the Trash, and found some broken aliases in there, too. I emptied the Trash, after clicking 'cancel' on each error message. Then, I quit and restarted iPhoto several times. The problem is gone! I then moved the photos out of the "Photos to Fix" album, and the problem has not returned.
In short:
- Find a broken photo in iPhoto, note the name
- Navigate to the photo in Spotlight (not finder)
- Drag it out of the iPhoto Library and onto the desktop
- Go back to iPhoto
- Select "Reveal in Finder" on the broken thumbnail
- iPhoto will go to the location the photo USED to be
- Go back to Finder
- Drag the photo back into its old location
- Go back to iPhoto
- Move that photo, and any other problem photos, to a new album
- Empty Trash if there are any problem files there, too
- Restart iPhoto
- Problem solved
That's what worked for me, though I admit it is wonky and illogical. Maybe someone can shed light on why this worked.

IPhoto 9.6, library update crashed, now cannot see photos

I am on a 2010 Macbook Pro 2.4 GHz Intel Core 2 Duo with 8gb memory and a 240 GB SSD. I recently upgraded from Mavericks to Yosemite, and updated to iPhoto 9.6 at that time. I initially had trouble getting it to install, but did succeed. It then repeatedly stalled while trying to update my library. My iPhoto library is located on an external HD. Tonight, I tried again, and it seemed like things were going ok. While updating thumbnails, it said I was "out of memory". I closed all other programs except finder, and tried to resume iPhoto. Waited some time, no luck. Eventually had to force quit, and rebooted. I was then able to open iPhoto, and it defaulted to the correct library, but nothing shows up. The library is 33.2GB (which seems appropriate), so I suspect that everything is still there, it just isn't viewable by me.
I didn't seem to be able to repair using option+command while it was on the external HD, so I copied it to my local HD. I set the library to the local copy. I tried repairing permissions, thumbnails, database. Nothing seems to happen. I tried rebuilding database. Again, nothing.
How do I fix this? I do have the external HD, including the iPhoto library, backed up on Time Machine. I also have separate backups of most (but not all) of the images because I have trust issues and I don't like that my mac packages it all up into one little bundle that I could lose all at once, but I'd rather not have to go around digging for those if it's not necessary.

Download iPhoto Library Manager and use its rebuild function. (In early versions of Library Manager it's the File -> Rebuild command. In later versions it's under the Library menu.)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places 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.

IPhoto 9.3 Rebuild/Updating Thumbnails

Similar Messages

Maybe you are looking for