Rebuilding thumbnails cache in iPhoto

iPhoto will rebuild the thumbnail cache, or rather ask you if you want it to be done, every time it feels the need. Sometimes this might not happen for a while and with a huge library your scrolling can become crawling if things go bad.

I have a library of some 1800 images and after doing clean OS X (Tiger) and iLife 06 install I have imported my images back but scrolling was, to say it mildly, a joke. After two days of using it iPhoto didn’t ask me to rebuild the thumbnails cache so I had to ask for it.

After exploring the menus and not finding anything there I have actually tried a few key-combinations while starting iPhoto up and there it was – hold Command and Option down while starting iPhoto. The result is the following prompt:

cache.jpg

Now select what you want iPhoto to do and click Rebuild.

Update 06 Oct 2007 - The original article was written with iPhoto 06 in mind, but the same works with iPhoto 08. The only difference is that iPhoto 08 has an additional function to examine and repair file permissions for iPhoto gallery.

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42 Comments.

  1. Thanks a lot. I’ve been having iPhoto troubles as well. And I’ve been trying to find the darned Rebuild Thumbnail options. Why does Apple hide things like this? Anyway, thanks a lot.

  2. This is fantastic. I have been prompted a couple of times to requild the thumbnails. It’s something I need to do but the times it has ‘decided’ to do it have been totally inconvenient and inappropriate.

    Thanks to this suggestion I can take control of my time! Thanks!

  3. Thanks so much. Several blind alleys looking for how to do this. I do like my Mac, and most of the software, but why they hide stuff like this I’ll never understand.

  4. This site rocks! I was searching google on how to rebuild my iPhoto cache and viola! here is Silver Mac. i have now linked you on my blog.

  5. Carolyn Layton

    What is the advantage of rebuilding iPhoto cache?
    I have about 10 folders in iPhoto and about 4000 pictures

  6. thank you! the web needs more people like you. cheers!

  7. OPTION-COMMAND clicking on iPhoto did NOT work for me. iPhoto 6.0.5. But SHIFT-OPTION-COMMAND clicking did.

    Thanks for pointing us in the right direction though.

  8. Thank you so much! Why they don’t document this I’ll never know. Cheer mate!

  9. Thanks so much! This has saved so much of my time….

  10. Thank you so, so, so much!

  11. THANK YOU!!!

  12. I was working in iPhoto 6.0.6 and it prompted me “Caution would you like to rebuild your thumbnail cache?” so i click ok, it took about a minute, and when it was through … all my thumbs in my iphoto library are gone!!!! PLEASE HELP!!! When I double click on them, you can see them in the edit screen, but not in the library to scroll through them! How do I get them back?? It wouldn’t let me undo my action either! PLEASE HELP ME

  13. Try selecting “Rebuild all of the photos’ thumbnails” and see if it works that way.

  14. Is there a cache for iphoto in the library originally installed by the program because I opened my caches folder and i can`t find any iphoto related file. The same happens with application support, there is iWeb but not Iphoto. I tried to zap iPhoto and reinstalled again but neither of those files appear in my library

    Thanks for feedback

  15. Thank you!!!

  16. Thank you so much for this. I’m hopefully that my iPhoto library might actually work now!

  17. I don’t like iPhoto. I love my apple iMac and eveerything else about it, but my 9000 photos are in a mess!! When I look on disc I have them in ‘data’, I haave two sets of originals and two sets of modified. I have some in the trash folder of iPhoto, but when I empty trash, they disappear from the library. I have loads of unknown ‘rolls’ on disc from when I first started using it and didn’t know to rename the roll. To start again will take me the best part of a week!
    Is there an easy way to just reinstall iPhoto and start afresh cos I reckon I’m gonna have to before it gets any worse!

  18. Ui Goldsberry

    Wonderful site. I have a thumbnail question. Whenever I make any changes to my original photos in iPhoto, I lose the thumbnail in my iPhoto library in my photos file. So, when I want to make a CD, or copy my photos onto a storage disc, the photos that I’ve changed, show up with a JPG document thumbnail. Is there any way I can assign a photo thumbnail to my changed pictures? It would make it much easier to locate the ones I want.

    Thank you so much for this service. It is really incredible.

  19. you are a rock star. so glad i spent only 15 minutes trying to figure it out unsuccessfully. APPLE – get a shortcut in the file menu for this!!!

  20. Lisa Stefanoff

    When I followed the prompt to upgrade my thumbnails nothing happened even though I was warned that it would ‘take a while’. Then the next time I opened iPhoto (6.0.6) all my thumbnails were gone. I’ve tried the COMMAND + OPTION, found the rebuild box, ticked all the rebuild boxes, but still nothing is being rebuilt. Anyone have any advice? Thanks, LS

  21. I just want to know exactly what it means to rebuild my thumbnail cache. Don’t want to do any mistakes and delete all my pictures

  22. Thank you SO much for this info. Why one can’t just type in “rebuild thumbnail cache” into the help files and get the same answer is BEYOND me.

  23. OK, I need to chime in as well. This was a VERY helpful find. Much appreciated.

    JV

  24. So did anyone figure out if this rebuilding of the thumbnail cache is actually worth it? I have about 2000 photos and a lot of them are RAW… should I do it? I definitely don’t want to lose my thumbnails… but I also don’t want the program to shut down on me or anything crazy… so basically:: does anyone have any advice for me?

  25. Thank you so much!

  26. THANKS A LOT MAN!!! OVER THE YEARS I’VE TAKEN MORE THAN 6000 PICS AND I JUST COULDN’T GET THE DAMNED THUMBNAILS WORKING AFTER I ACCIDENTALLY ERASED THEM. YOU’RE A GENIOUS!!!!

  27. Thank you! I said no to rebuilding cache a couple times – then realized maybe it would help my slow scrolling. Searched help in IPhoto for a way to force it (no answer found!) and your response came up first in Google.

  28. Thanks!

  29. Thanks for that, wouldn’t have guessed that…

  30. Flipping great – thanks fro0m me too – I even rang apple help and they coudn’t tell me how to do it!!! Well done!

  31. Thanks….I have been trying to figure this out for quite some time…..btw for iPhoto 6 shift-command-option works….but I had to rebuild the entire photo cache instead of the small thumbnails…..and the operation is really memory consuming…..

  32. Thanks for posting this!!! I have the same problem with iPhoto 7.5 and worked GREAT! =D

  33. Thank you, your info was invaluable. I’ve been waiting for 3 weeks for iphoto to ask me to rebuild, so your quick tip was excellent.

  34. I used to wait for iPhoto to prompt before I could rebuild. I never thought I could activate it myself.
    Thanks for the info. I really appreciate it.

  35. Professor Twahn

    works for iphoto 11 as well.

  36. If none of the usual cmd+apple key tricks or the rebuild help you, it may be that you moved your iphoto library using the wrong tool (like me).

    I lost all Thumbnails and rebuilding did nothing, after some fruitless search, I found that the thumbnails are actually stored in the Data.noindex folder in the application package. The Album.xml will address a /Data/ folder for the thumbnails. I had only a FILE called “Data”. Comparing with the original library, I found that Data was supposed to be a softlink pointing to Data.noindex.

    So: If rebuilding and repairing won’t work for you, check if you have the link set correctly. If not, you open a Terminal and cd to the library bundle folder:

    > cd /Volumes/nasfolder/iphonelibrary/

    now make sure it is not a link:

    Correct entry:

    $ ls -l Data
    lrwxrwxrwx@ 1 asciimo staff 12 13 Jan 10:42 Data -> Data.noindex

    Broken entry:
    -rw-rw-rw- 1 asciimo staff 14 29 Dez 01:26 Data

    To fix it, remove the broken entry (iPhoto must be closed!!!)
    $ rm Data

    Now recreate the link
    $ ln -s Data.noindex Data

    check with the ls -l command above if the file is now correct.

    Restart iPhoto, now your Thumbnails will be back.

  37. ف wildchild ۞

    Thanks asciimo.. It really work!!

  38. Thank you this worked for me last night. Took forever but it worked. I have iPhoto 11 also.

  39. hey guys. both way didnt work for my iphoto.
    i fixed it from different way.

    1.turn iphoto off.
    2.press option button and run iphoto again.
    3.give a different name and create new library.
    4.try import your photos again. u ll see thumbnails.

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