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Apply a vignette to a photo in Photos on Mac
You can use a vignette to darken the edges of a photo and emphasize the center of the image. You can adjust the darkness and size of a vignette to create the look you want, and soften the vignette for a less dramatic effect.
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In the Photos app
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 Vignette.
Drag the sliders to adjust the vignette.
Strength: Darkens or lightens the vignette.
Radius: Changes the size of the vignette.
Softness: Changes the opacity of the vignette, making it more or less pronounced.