Correcting chromatic aberration

Chromatic aberration is a lens artifact that can result in fringes in high contrast areas of some photos. The camera lens can cause different wavelengths of light to focus differently, which appears in photos as colored fringing or colored lines on the borders of high contrast areas. Purple fringing can also occur when there is a bright spot of light in front of the lens.

This zoomed-in image shows an example of blue/yellow fringing.

You can use the Defringe and Chromatic Aberration tools in Develop mode to reduce the appearance of colored fringes. This can be especially useful for photos with architectural details. For best results, it's recommended that you use the Chromatic Aberration sliders first, and then the Defringe sliders. You can also save your options as a preset for future use.

To reduce fringing in your image:

In Process mode, click Develop.
In the Develop pane, select the Detail tab.
In the Chromatic Aberration group, adjust the sliders as described below.

Chromatic Aberration options

Fix Red/Cyan	Adjust the red and cyan channels to reduce red/cyan fringing.
Fix Blue/Yellow	Adjust the blue and yellow channels to reduce blue/yellow fringing.

Defringe options

Defringe strength	Adjust the amount of fringe color to remove from high contrast edges. A setting of zero means that defringing is off.
Defringe radius	Adjust the number of pixels surrounding an edge that will be defringed.
Color	Adjust the color to remove from high contrast edges.