I have two Macs: an iMac (20-inch Early 2008) with Mac OS X Lion 10.7.5 and a MacBook Pro (13-inch, Mid 2012) with OS X Yosemite 10.10.3.
Both computers back up to a 2TB Time Capsule.
I need to copy all of my photos from the iMac to the MacBook Pro.
I tried this by copying the iPhoto library file located in the Pictures Folder on the iMac to the Pictures Folder on the MacBook Pro. It doesn't copy over entirely: photos and thumbnails are missing among other things.
I believe the that having different versions of OS X may be the cause of this. What can I do to correctly migrate my pictures?