Dfx User Guide - Tiffen.com

Defringe
Purple or blue fringing around overexposed areas is a result of sensor
overloading in video as well as digital still cameras. Defringe isolates and
removes the various types of color fringing.
Filter Tutorials 81
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1 Apply Defringe from the Lens category.
Determine the color of the fringing that you would like to remove. Let’s say that
you have purple fringing in the highlight areas of your image.
2 If the Parameters window is not showing, click the Parameters tab at the bottom
of the Presets window.
3 Go to the Magenta parameter group.
4 Move the Magenta slider to the right until the purple fringing is gone.
5 If the purple fringing is not being removed when the Magenta slider is adjusted,
you may need to adjust the Position slider.
6 Change your View to Magenta to see the selection values.
The areas that are white in the selection are the areas that will be defringed.
7 Change your View back to Output.
8 Move the Position slider to the right or left until you see the fringing go away.
This may be necessary if your purple fringing is not the same hue of what we
consider to be magenta.
9 If there is still some magenta left, you may want to increase the value of the
Range slider to include more values considered as magenta.
10 Click the Done button to apply the filter to your image.
See the Defringe filter on page 294 for more information.
Dfx User Guide
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