Brush the Halo Reduction adjustment on an image
You use the Halo Reduction Quick Brush adjustment to remove the blue and purple fringes that are occasionally produced with certain lenses when an image is overexposed.
Selectively blue and purple fringing in an image
Select a photo.
Do one of the following:
In the Adjustments inspector or the Adjustments pane of the Inspector HUD, choose Quick Brushes > Halo Reduction from the Add Adjustment pop-up menu.
In the tool strip, choose Halo Reduction from the Quick Brush pop-up menu .
The Halo Reduction Brush HUD appears, and the Halo Reduction adjustment controls appear in the Adjustments inspector and the Adjustments pane of the Inspector HUD, if both are shown.
Specify the brush stroke settings using the controls in the Halo Reduction Brush HUD.
Brush the adjustment on the area of the image where you want to remove the halo effect.