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Correct barrel distortion-tutorial
Many photo editing programs have tools which let you correct barrel distortion. This tutorial illustrates the technique using the Perspective and Free Transform tools in Photoshop 7:
Perspective Tool
1- Select the Perspective Tool (Edit menu > Transform > Perspective). Once the Perspective Tool is selected, pull one of the upper handles to the right (or left).
Free Transform Tool
2- A subject tends to shorten when using the Perspective Tool so, next, use the Free Transform tool (Edit menu > Free Transform) to drag the middle of the photo upward. Some cropping of the image will occur.
It is important to correct barrel distortion on a full sized image. Only after it is corrected should you reduce image size or make other adjustments such as brightness and contrast, sharpening, etc. Check your program's HELP menu for detailed instructions.
