
Support for RAW photos was added to iPhoto in version 5, and iPhoto Library Manager supports copying RAW photos between libraries. When using iPhoto 7.0 or later, iPhoto Library Manager can copy RAW photos just the same as any other photo, including both the original RAW and the edited JPG/TIFF version of each photo. However, if you have iPhoto 6 or earlier, due to technical limitations, iPhoto Library Manager cannot copy both the original and modified versions - it will only be able to copy one of the two. You can choose which one you want to copy in the Photo Copying section of iPhoto Library Manager's preferences window.
Starting in iPhoto 7, Apple added support for marking photos in iPhoto as "hidden". These photos are still in the library, but they no longer appear normally when you browse through your photos in the iPhoto window. You can toggle the display of hidden photos by choosing "Hidden Photos" from the View menu in iPhoto. This will cause hidden photos to appear in the iPhoto window, but marked with a small orange X to signify that they are normally hidden.
iPhoto does not include hidden photos in the file that iPLM reads to display a library's list of albums in its main window. So, if you have hidden some photos in your library, those photos will not be reflected in the photo counts you see next to the albums displayed in iPhoto Library Manager, even if you have chosen to have those photos displayed in iPhoto using the View menu. However, regardless of what gets displayed in the album list, when you copy photos or merge libraries with iPhoto Library Manager, it will copy photos even if they are hidden in iPhoto (though you can turn this off if you want to in the preferences window).