Defringe

Purple fringing, or bichrominance as it's more correctly termed, is a form of chromatic aberration caused by the over-excitation of the pixels on the sensor in the camera. The effect can occur anywhere within an image but it's most common at the edges of high contrast areas, especially when a dark element is strongly backlit, such as branches silhouetted against a blue sky. The Defringe filter selectively adjusts these areas to remove the colour fringing.

Before
After
Using the Defringe filter to remove purple fringing from the wall edge.

About the Defringe filter

This filter can be applied as a non-destructive, live filter.

On selecting the Defringe filter, it will default to settings which remove the purple fringing, as this is the most common type. This can be manually adjusted as necessary on the context toolbar, or by sampling the fringe colour on the page to remove it.

Settings

The following settings can be adjusted on the vertical sliders:

The following settings can be adjusted on the context toolbar:

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