CORRECTING IMAGE DISTORTION
STEP : 1
Open an image in your workspace that contains some kind of lens flaw or perspective issue. For instance, the image in Figure 26-1 has a sign pole that, due to lens distortion,appears to be tilting backward.
Figure 26-1
STEP : 2
Choose Filter > Lens Correction (in CS5, choose Filter > Distort > Lens Correction) to open the Lens Correction dialog box, where you’ll see a preview of your image with a grid overlay. If needed, use the buttons on the top-left edge of the dialog box to remove distortion, straighten the image to a new horizontal or vertical axis, or reposition the grid.
Otherwise, in the Auto Correction tab, select the camera used to create the image from the Camera Make menu, and then choose the appropriate model and lens from the Camera Model and Lens Model menus. After making your lens selection, click the check boxes as needed to include corrections for geometric distortion, chromatic aberration, and vignette.
[box type="info"] HINT: If you don’t see the lens make or model that you need, click around until you can find something comparable. [/box]
STEP : 3
In the Custom tab, add or subtract additional lens correction settings. For instance, you can use the Vignette slider to add or subtract a vignette to your image. You may also want to adjust the Vertical and Horizontal Perspective sliders to correct distortions, like the pole in the example. Click OK to apply your settings to your image. Figure 26-2 shows the corrected image with an added vignette.
Figure 26-2
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