Graphics Programs Reference
In-Depth Information
Correcting image distortion
The Lens Correction filter fixes common camera lens flaws, such as barrel and
pincushion distortion, chromatic aberration, and vignetting.
Barrel distortion
is a
lens defect that causes straight lines to bow out toward the edges of the image.
Pincushion distortion
is the opposite effect, causing straight lines to bend inward.
Chromatic aberration
appears as a color fringe along the edges of image objects.
Vignetting
occurs when the edges of an image, especially the corners, are darker
than the center.
Some lenses exhibit these defects depending on the focal length or the f-stop used.
The Lens Correction filter can apply settings based on the camera, lens, and focal
length that were used to make the image. The filter can also rotate an image or fix
image perspective caused by tilting a camera vertically or horizontally. The filter's
image grid makes it easier and more accurate to make these adjustments than us-
ing the Transform command.
1.
Choose File > Browse In Bridge.
2.
Navigate to the Lesson05 folder if you're not already there, and then look
at the Columns_Start.psd and Columns_End.psd thumbnail previews.
