Operation Manual

Working with the Chromatic Aberration Controls
When you want to fix chromatic aberration, also known as purple fringing, you use the
Chromatic Aberration adjustment controls. For example, if your image has a ghost image
in high-contrast boundary areas, you use the Chromatic Aberration adjustment controls
to neutralize the color fringing. Chromatic aberration can be caused by a poorly designed
lens that fails to focus light at the correct point on the focal plane when the lens is set at
different focal lengths. Certain types of light sources can also cause chromatic aberration.
Before Chromatic Aberration adjustment After Chromatic Aberration adjustment
(increased cyan)
Important: The Chromatic Aberration adjustment controls are available only for images
using Aperture 3 image processing. For more information about reprocessing your images,
see Reprocessing Images from Previous Versions of Aperture.
To remove chromatic aberration from an image
1 Select an image.
2 If the Chromatic Aberration controls are not shown in the Adjustments inspector or the
Adjustments pane of the Inspector HUD, choose Chromatic Aberration from the
Adjustments pop-up menu.
3 If your image exhibits red or cyan fringing, neutralize it by doing one of the following:
• Drag the Red/Cyan slider to the right to add cyan, neutralizing the red fringing, or drag
the slider to the left to add red, neutralizing the cyan fringing.
• Click the left or right arrow in the Red/Cyan value slider, or drag in the value field.
525Chapter 17 Making Image Adjustments