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I scanned a photo onto my computer, but there are some slight warping that formed when scanned the image. The photo is not perfectly square, and the photo is slightly curved. Below is a much exaggerated example, where the red box represents my photo, and the blue box represents a perfect rectangle, anchored at the top left and bottom right of the image.

enter image description here

What transformations / techniques can I use to correct this?

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    \$\begingroup\$ Was the scanner a flatbed, or a sheet feeder? If a flatbed, was the lid shut to hold the photo flat? Rescanning it seems the best answer. \$\endgroup\$
    – WayneF
    Commented Jan 16, 2016 at 17:16
  • \$\begingroup\$ Scanner was a flatbed. Lid was shut. I had to do it at FedEx because my scanner wasn't large enough. Don't feel like going back. The image above is much exaggerated - I will do my best to fix it, but if not, I can live with the minor warping. \$\endgroup\$
    – dberm22
    Commented Jan 16, 2016 at 19:38

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In the past, I have used ImageMagick to perform all sorts of complex distortions of images to straighten, de-skew, etc. Unfortunately, the tool is command-line oriented (it's not a GUI tool), but it provides you a lot of control over what you want to do.

Your case is covered in the Circular and Radial Distortion Methods of the online user guide.

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    \$\begingroup\$ Image Magick looks like a nice little utility. Ultimately, I was able to fix it in PaintDotNet with the Grid Warp plugin. Thanks anyway. \$\endgroup\$
    – dberm22
    Commented Jan 16, 2016 at 19:40
  • \$\begingroup\$ Glad to hear. I have not heard of PaintDotNet before. I will have to take a look at it. \$\endgroup\$
    – scottbb ♦
    Commented Jan 16, 2016 at 20:24

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