# PhotoshopElements

# Correct camera distortion

The Correct Camera Distortion dialog box enables you to fix common lens distortion problems, like darkened edges caused by lens faults or improper lens shading. For example, in a picture of the sky taken in low light, the corners of the image may be darker than the center. Changing the vignette amount and midtone settings fixes the distortion.

You can also use the perspective controls to rotate an image or fix image perspective caused by vertical or horizontal camera tilt. The Correct Camera Distortion filter’s image grid allows you to make these adjustments easily and accurately.

Correct camera distortion

1. Select Filter > Correct Camera Distortion.
2. Click Preview.
3. Set any of the following options to correct your image, and then click OK:
   Remove Distortion
     Corrects lens barrel or pincushion distortion. Type a number in the box, or move the slider to straighten horizontal and vertical lines that bend either away from or toward the center of the image.

   Vignette Amount
     Sets the amount of lightening or darkening along the edges of an image. Type a number in the box, or move the slider to gradually shade the image.

   Vignette Midpoint
     Specifies the width of area affected by the Amount slider. Move the slider, or type a lower number to affect more of the image. Type a higher number to restrict the effect to the edges of the image.

   Vertical Perspective
     Corrects image perspective caused by tilting the camera up or down. Type a number in the box or use the slider to make vertical lines in an image parallel.

   Horizontal Perspective
     Detects the edges and detail in an image, provides finer detail, and reduces halos. Type a number or use the slider to reduce the blur caused by camera or subject movement. Set the Angle control if you choose Motion Blur.

   Angle
     Rotates the image to correct for camera tilt or to make adjustments after correcting perspective. Type a number in the box or drag the angle dial to rotate the image to the left (counterclockwise) or right (clockwise).

   Scale
     Adjusts the image scale up or down. The image pixel dimensions aren’t changed. Type a number in the box or use the slider to remove blank areas of the image caused by pincushion, rotation, or perspective corrections. Scaling up effectively results in cropping the image and interpolating up to the original pixel dimensions.

   Show Grid
     Shows the grid when selected. Hides the grid when deselected.

   Zoom
     Shows a closer view when you zoom in, and shows a more distant view when you zoom out.

   Color
     Specifies the grid color.

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- Adjust color curves
- Improve shadow and highlight detail

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