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. To see how it works watch the screencast on my website.

Features:
- Edited images are saved back to Photos immediately and your original photos are updated in place.
- All metadata will be preserved.
- Open your imported RAW files with your favorite RAW-Converter and replace it with your edited version.
- No data lost: You can always revert back to your original files.
- Works even in your book-projects.
- Edited Photos will sync across all your devices.

Usage:
- To use the extension find a picture in Photos and double-click
- Click the Edit button in the upper right window corner
- Select the Extensions from the icon bar on the right.

Tipp:
- Pressing Enter in the photo overview is a shortcut to switch directly into Photos edit mode.
- Also, you can paste or drag any image into the picture frame within the extension.

Have Fun!