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I am looking for a method for detecting if an image contains only black pixels. When I say method I mean an existing command line tool. I could write up something myself but I'm sure something probably exists already.

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  • Do you want to detect exact black pictures RGB(0,0,0), or also dark pictures like ones with too short exposure? Commented Sep 13, 2014 at 17:05
  • See unix.stackexchange.com/a/792272/400632 Commented Mar 10 at 23:14

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I bet that Imagemagick is what you want. In fact, there's an Imagemagick forum entry that probably fits your needs.

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