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I have a web-app that has very many pictures. Is there a linux commandline utility which I can use to "auto-optimize" all JPEG pictures in a Photoshop-like way. Maybe with Gimp in the backend or so?

Best, ww

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You could probably use ImageMagick - it is a command line tool that allows to do things like image sharpening, contrast stretching or adjusting the gamma level (see the full list here:

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