Reprocess imported RAW files
If you import RAW files that were already processed by another app, such as Aperture, the RAW processing of the photos might be out of date. The RAW processing used by Photos may also be updated when Apple releases a Digital Camera Raw Compatibility Update or an updated version of macOS. If you’re happy with how a RAW photo looks, you can leave it as is, or you can choose to reprocess the RAW file with the most recent version of Apple’s RAW processing software. Note that your photos may look different after reprocessing, and you cannot undo this change.
Double-click a photo to open it, click the Edit button in the toolbar, then choose Image > Reprocess RAW.
Note: If the Reprocess RAW command appears dimmed in the menu, the raw processing of the photo is up to date.