Adobe Photoshop CS6 Top 100 Simplified Tips and Tricks by Lynette Kent

CORRECT GEOMETRIC DISTORTION with the
Lens Correction filter
Depending on the focal length of a camera lens or the
f-stop used, a photograph may show common lens flaws
such as barrel and pincushion distortion. Barrel distortion
causes straight lines to bow out toward the edges of the
image. Pincushion distortion displays the opposite effect,
where straight lines bend inward. If the camera tilts up
or down or at any angle, the perspective also appears
distorted. The Lens Correction filter in Photoshop can
help you correct these and other lens defects.
The Lens Correction filter in Photoshop includes an
automatic correction based on specific lens profiles. If
your lens and camera are listed in the profiles, you
can click the option to automatically correct geometric
distortion as well as remove a vignette, the
appearance of darker corners or edges in the image,
and any chromatic edge discolorations, called
chromatic aberration.
You can also choose to correct the distortions manually
using the tools on the left of the Lens Correction dialog
box. You can line up the perspective of the buildings
with a vertical plane and even turn on the filter’s
image grid to make your adjustments more accurately.
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1
Use the Automatic Correction
1 Open an image as a Smart
Object, or open a file and convert
it to a Smart Object layer.
Note: Opening as a Smart Object
enables you to make changes
nondestructively and edit the
changes after they are applied. See
task #20 for information about
Smart Objects.
2 Click Filter.
3 Click Lens Correction.
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6
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5
The Lens Correction dialog box
appears with a large preview of
the image.
4 Click the Camera Make and
Camera Model drop-down
menus and select the camera
make and model.
5 Click the Lens Model drop-down
menu and select the lens model if
applicable.
6 Click the Lens Profile.
7 If the correction is satisfactory,
click OK to commit the changes.
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