I'm relatively new to Mac and recently purchased aperture. I set up my aperture library by referencing my iPhoto library since I have over 18,000 photos and didn't want aperture to make 18,000 copies. I must be misunderstanding what "referencing" files means because I recently went through a couple events in iPhoto and deleted a number of photos. I then emptied the iPhoto trash, however when I open aperture, those photos are still in the aperture library. How is this possible if the referenced file was permanently deleted? Also, I know I should probably move completely to aperture for my organization and ditch iPhoto but I haven't completely figured out how I want to organize everything, so for now I'm leaving everything in the iPhoto library and referencing the library in aperture.... Or so I thought. So if anybody can point out where my logic is flawed, I would appreciate it. It's driving me crazy that its not logical to me.