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Reduce noise in a photo in Photos on Mac
Photos taken in low light may appear with graininess or speckles, referred to as noise. You can reduce or eliminate noise in photos.
Note: Noise reduction also works with photos in RAW file format.
- In the Photos app  on your Mac, double-click a photo, then click Edit in the toolbar. on your Mac, double-click a photo, then click Edit in the toolbar.
- Click Adjust in the toolbar. 
- In the Adjust pane, click the disclosure triangle next to Noise Reduction. 
- Drag the Noise Reduction slider until you’re satisfied with the results.  - Note: When you edit RAW images (RAW version 6 or later), Luminance Noise, Color Noise, and Detail sliders appear for fine-tuning noise reduction.