If you are using Mac and you get your photos sync via iCloud, you are usually open/view the photos in the Photos app. If you need to modify a photo using the Preview tool you have to:
1. Export your photo from Photo App to your local drive (File -> Export -> Export 1 Photo…)
2. Select your photo format (kind) and click Export
3. Select your location on the drive and click export
Now you have a copy of your photo on your local drive … open it with Preview or any other photo viewer/editor.
Have fun!
Mac photo editor helps user to edit multiple photos with easy to use feature with backup option and the best part is you can remove noise within the images.You can use these apps listed here which will make your image looks adorable and stunning.