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Adjust definition in a photo in Photos on Mac
You can change a photo’s definition settings to add contour and shape as well as mid-tone definition and local contrast.
- 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 Definition. 
- Drag the slider until you’re satisfied with the results. 