You can import a library other than the default one you used with iPhoto into Photos by holding down the Option key and launching Photos. Oon iPhoto and hold down Option to zen mosaic sale
a library, but then hold down Command and Option when clicking Choose. Choose the last option, Rebuild Database. It can take some time. Select an item to see the path to distinguish among generic and same-named entries. You have a few different paths to take, although you will lose something no matter which route you opt for. As the above-mentioned Jeff noted to me: The problem with export is that iPhoto is terrible about exporting data.