Simply select the image you want to open in the Mac OS X Finder and drag it from the Photos app to a folder on the Mac desktop.
This means that you will have to use a workaround to access the original image, perhaps the simplest is a simple drag and drop: If you choose to keep the standard Photos feature of importing and copying images to a separate photo library, “Show reference file in Finder” will not be available to you. Option 2: Access the original image file with drag & drop from Photos app to a Mac folder Whichever way you open this feature, you will end up in the Finder with the original image selected.
