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Automatically restoring verticality of the edges of a scanned photo

I want to scan a collection of rectangular photos, both color and black-and-white. I am generally quite happy with the scanning, but I run into some practical problems, due to the fact that photos are ...
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To Adjust Brightness-Contrast in Plane with Gimp/ImageMagick/…?

This kind of plane is a common tool used to view Rontgen pictures in Radiology. It exists as a standard in many RTG programs in hospitals. I would like to have a similar tool open-source for ...
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How to extract comment from ppm file?

I have ppm file X.ppm with comment : xxd X.ppm|head -10 0000000: 5036 0a23 206d 6967 6874 796d 616e 6465 P6.# mightymande 0000010: 6c20 2d32 2e38 3034 3132 3232 3037 3833 l -2.80412220783 0000020: ...