Photoshop.

To use this tool, follow these steps:

1. Choose Filters > Distort > Lens Correction to produce the dialog box.

2. If you want to use the tool's grid to help you align the image, make sure the Grid box at the bottom of the dialog is marked.

3. Press D to activate the Remove Distortion tool, and then drag portions of the image to correct for the kind of distortion your image requires. Or, use the Remove Distortion Slider (your best choice for ease of use, plus if you want to apply the same amount of correction to several different images).

4. As you correct the image, it will change in the preview window, and the Remove Distortion slider will show how much correction is being applied. Movement of the slider to the left indicates adding a barrel effect (to counter pincushion distortion), whereas moving it to the right counteracts barrel distortion. Figure 2.61 shows correction of a pincushioned image, while Figure 2.62 shows repair of an image with barrel distortion.

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