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The Book of GIMP by Karine Delvare, Olivier Lecarme

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2.1 Tutorial: Enhancing Badly Taken Photographs

Most photographs can be improved with digital processing, but finding a single photograph with every possible defect is difficult. Therefore, we’ll have to demonstrate the many useful photo-correction techniques you can do with GIMP on several different sample photographs.

Cropping, Straightening, and Restoring Perspective

The photograph shown in Figure 2-1 needs to be cropped and straightened. We then need to restore the perspective. This image could also use some lighting correction to enhance visibility inside the church. First, however, we’ll straighten out the picture. To do this, we determine the rotation angle and then use the Rotate tool to level the image.

The rotation angle can be measured ...

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