I tried transferring my iphoto library from my old macbook onto my new macbook pro (via external hard drive), but when i open the new iphoto, it seems to have transferred ALL images ever used on my old macbook. so i tried to just del
MacBook Pro, OS X Mountain Lion (10.8.2), iphoto '11, version 9.4.2
To move an iPhoto Library to a new machine:
Link the two Macs together: there are several ways to do this: Wireless Network,Firewire Target Disk Mode, Ethernet, or even just copy the Library to an external HD and then on to the new machine...
But however you do choose to link the two machines...
Simply copy the iPhoto Library from the Pictures Folder on the old Machine to the Pictures Folder on the new Machine.
Then launch iPhoto. That's it.
This moves photos, events, albums, books, keywords, slideshows and everything else.