To Compensate For Chromatic Aberration In Camera Raw; To Compensate For Lens Vignetting; To Remove A Shadow Color Cast In Camera Raw Files - Adobe AFTER EFFECTS 7.0 Manual

To compensate for chromatic aberration in Camera Raw

Chromatic aberration is a common defect caused by the failure of the lens to focus different frequencies (colors) to
the same spot. In one type of chromatic aberration, the image from each color of light is in focus, but each image is
a slightly different size. This type of aberration is seen as a complementary color fringing in areas away from the
center of the image. For example, you may see a red fringe on the side of an object toward the center of the image,
and cyan fringe on the side of the object away from the center of the image.
Original image (top), and after fixing chromatic aberration (bottom)
Zoom into an area near the corner of the preview image. For the best results, the area should contain very dark or
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black detail against a very light or white background. Look for the color fringing.
In the Lens tab, move one or more of the following sliders:
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Adjusts the size of the red channel relative to the green channel. This compensates for red/cyan
Fix Red/Cyan Fringe
color fringing.
Adjusts the size of the blue channel relative to the green channel. This compensates for
Fix Blue/Yellow Fringe
blue/yellow color fringing. Look at the preview image as you move the slider left or right. If you're adjusting red/cyan
color fringing, you can hold down Alt (Windows) or Option (Mac OS) to hide the blue/yellow color fringing.
Similarly, hold down Alt (Windows) or Option (Mac OS) while adjusting the blue/yellow color fringing to hide the
red/cyan color fringing. The goal is to reduce the color fringing as much as possible.

To compensate for lens vignetting

Vignetting is a lens defect that causes the edges, especially the corners, of an image to be darker than the center.
1 In the Lens tab, move the Vignetting Amount slider to the right (positive values) to lighten the corners of the
image or to the left (negative values) to darken them. You can also enter a value in the Vignetting Amount box.
Move the Vignetting Midpoint slider to the left (lower value) to apply the Vignetting Amount adjustment to a
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larger area away from the corners, or move the slider to the right (higher value) to restrict the adjustment to an area
closer to the corners. You can also enter a value in the Vignetting Midpoint box.

To remove a shadow color cast in camera raw files

Sometimes a color cast remains in the shadow areas after you adjust the highlight white balance using the Temper-
ature and Tint sliders. The Calibrate tab has a Shadow Tint slider to correct this remaining shadow color cast.
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In the Calibrate tab, move the Shadow Tint slider to remove the color cast in the shadows. The camera's sensor and
the white balance affect which colors are adjusted. Usually, moving the slider to the left (negative values) adds green
to the shadow areas, and moving the slider to the right (positive values) adds magenta.
ADOBE AFTER EFFECTS 7.0 85
User Guide