Chromatic aberrations occur in areas where your lens can't focus red, green, and blue light along edges of the image to the necessary degree of precision. The Lens tab gives you two controls to counteract those aberrations: the Fix Red/Cyan Fringe slider and the Fix Blue/Yellow Fringe slider.
Here's how to use them to correct chromatic aberrations:
1. Zoom in on your image to 100 to 200 percent.
2. Using the Hand tool, move around the image to determine whether color fringing exists.
3. If you detect red or cyan fringing on edges of the image (as illustrated in Figure 9-24), use the Fix Red/Cyan Fringe slider to minimize it.
4. If you detect blue or yellow fringing on edges of the image, use the Fix Blue/Yellow Fringe slider to minimize it.
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