Distortion Correction
The Distortion Correction filter corrects barrel, pincushion, and fisheye distortion in digital photographs. In barrel distortion, the photo appears to bulge outwards from the center. In pincushion distortion, the photo appears to shrink inwards toward the center. In fisheye distortion, the photo appears to bulge outwards from the center, as if the photo were wrapped around a sphere.
Barrel, pincushion, and fisheye distortions are common in photos taken with wide angle or zoom lenses.
Customized settings can be saved as a preset for future use. Presets can be selected from the Presets drop-down, or saved by clicking the adjacent Save icon.
To correct distortion:
- Select Filter | Geometry | Distortion Correction from the main menu, or press Alt + Z.
- In the Distortion Correction dialog, make a selection from the Presets drop-down list, or set the options as described below
- Optional: Save any customized settings as a new preset.
- Do one of the following:
- Click OK to apply any changes and close the tool.
- Click Cancel to discard all changes and close the tool.
Distortion Correction Options
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Horizontal Center |
Drag the slider to the left or right to identify the center of the image on the horizontal axis. |
|
Vertical Center |
Drag the slider to the left or right to identify the center of the image on the vertical axis. |
|
Correction Strength |
Drag the slider to the right until the objects in the photo appear to be straight. |
|
Scale |
Drag the slider to the left or right to change the scale of the photo. |
|
Background Color |
When correcting distortion in a photo, the edges of the photo may bulge outwards or shrink inwards. Use the Background color color picker to select a color for filling-in gaps in the corners or sides of a corrected photo. Enable the Transparent checkbox to use transparency to fill-in gaps in the corners or sides of a corrected photo. |
|
Type of Distortion |
Enable either the Barrel, the Pincushion, or Fisheye radio buttons to change the distortion type effect on the image. |
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Show Grid |
Enable the Show Grid checkbox to display a grid over the photo, which is useful for assessing whether objects in the photo are straight. |
Right-click a slider to reset to the default value.