External Editors For Photos adds an extension to the OS X Photos application that allows you to edit your photos with any image editor on your Mac. The program tries to find every app that can handle the current image, but lets you also have a list of your favorite editors that you can manage yourself. If you have a workflow that starts with a folder, you can copy the images from the extension into any folder you like. The edited images are saved back to Photos and your original photos are updated in place. All metadata will be preserved.