Updating thumbnails in iphoto
If you were previously using i Photo or Aperture, after clicking Getting Started, it detects your i Photo and Aperture libraries. Once you select the library, it presents the option to set up i Cloud Photo Library, Apple’s i Cloud-based photo and video syncing and storage service.
The paths to the missing files are logged in the Duplicate Annihilator debug log file located in your home folder.Thumbnails are low resolution photos used internally by i Photo to speed up performance when growing the photos.However, sometimes when importing older libraries into new ones or when upgrading i Photo those internal low resolution photos are imported as regular photos and all of a sudden your i Photo Library is flooded with low resolution photos.Here’s how to migrate your photo library to the new Photos app from i Photo or Aperture, both of which will no longer receive support for software updates going forward: After pressing Get Started in the blue box as seen above, you have two different options.If you are brand new to photo organizing on a Mac and have never used i Photo or Aperture before, (or if you don’t want to migrate your i Photo or Aperture library to Photos), you have the option to import pictures from your digital camera or SD card, drag files directly into Photos, import pictures from the File menu or turn on i Cloud Photo Library under preferences.Your old photo libraries will still stay on your Mac if you decide you want to use i Photo or Aperture for doing something.
One might still want to use Aperture because it is a lot more advanced with support for plug-ins and more for professional photographers, with powerful editing tools and built-in support to use external editors.
i Photo contains two things: a data base with information about you photos and a file structure with your photos.
A missing photo is when there is a reference to specific file path in the data base and that file does not exist.
Our long national i Cloud photo-syncing nightmare is over: Photos for OS X, Yosemite's official successor to i Photo, is now available with OS X 10.10.3. Your old library won't be converted, just imported, so you can still open it in Aperture or i Photo if you like (though once you import, if you do anything new with that library in Aperture, it won't carry over to the Photos version).
When you first launch Photos, it'll either auto-convert your primary library or ask you to pick which library you'd like to import.
Though it may appear in the Finder that both libraries are taking up the same storage capacity, only one library — your Photos library — has the majority of the data.