Adobe Photoshop CS6 User Manual page 326

In the Color tab of the Lens Correction panel, select the Remove Chromatic Aberration checkbox.
Remove global purple/magenta and green fringes
In the Color tab of the Lens Correction panel, adjust the purple and green Amount sliders. The higher the amount, the more color defringing. Take
care not apply an adjustment that affects purple or green objects in your image.
You can adjust the affected purple or green hue range using the Purple Hue and the Green Hue sliders. Drag either end-point control to expand or
decrease the range of affected colors. Drag between the end point controls to move the hue range. The minimum space between end points is ten
units. The default spacing for the green sliders is narrow to protect green/yellow image colors, like foliage.
Note: You can protect edges of purple and green objects using the local adjustment brush.
Press the Alt/Option key as you drag any of the sliders to help visualize the adjustment. The fringe color becomes neutral as you drag to remove
the color.
Remove local color fringes
Local brush and gradient adjustments remove fringes of all colors. Local defringe is available for Process Version 2012 only.
Select the brush or gradient tools and drag in the image.
Adjust the Defringe slider. A plus value removes the color fringe. Minus values protect image areas from defringing that you apply globally.
Minus 100 protects the area from any defringing. For example, applying a strong global purple defringe can desaturate or alter edges of
purple objects in your image. Painting with Defringe -100 over those areas protects them and keep them at their original color.
For best results, perform any Transform lens corrections before applying local color defringe adjustments.
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