3.4

Chapter 16 Making Image Adjustments 327
4 If your image exhibits blue and yellow fringing, neutralize it by doing one of the following:
•
Drag the Blue/Yellow slider to the right to add yellow, neutralizing the blue fringing, or drag
the slider to the left to add blue, neutralizing the yellow fringing.
•
Click the left or right arrow in the Blue/Yellow value slider, or drag in the value eld.
•
Double-click the number in the Blue/Yellow value slider, then enter a value from –5.0 to 5.0
and press Return.
Use the Blue/Yellow slider
and value slider to neutralize
blue and yellow fringing.
The chromatic aberration is removed from the image.
You can also brush the Chromatic Aberration adjustment on selected parts of an image. For
more information, see An Overview of Brushed Adjustments on page 392.
Working with the Devignette Controls
You use the Devignette adjustment controls to correct a vignette that was applied to an image
as it was shot. The term vignette describes an image whose brightness fades to its periphery from
its center. Vignettes are usually caused by poor lens design, stacked lters, lens hoods, and wide-
angle zoom lenses. Aperture corrects the image by increasing the brightness on the edges of the
image where vignettes typically occur.
Note: When you apply a Devignette and Crop adjustment to the same image, Aperture applies
the Devignette adjustment prior to the crop in order to correct lens artifacts. Applying the
Devignette adjustment before the crop prevents any distortion that would otherwise appear in
the cropped image.
Before Devignette adjustment After Devignette adjustment
To remove the vignette from your image
1 Select a photo.
2 If the Devignette controls are not shown in the Adjustments inspector or the Adjustments pane
of the Inspector HUD, choose Devignette from the Add Adjustment pop-up menu.