Paperless office; document/image processing

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Everything related to maintaining a paperless office running on free software.

Discussions include image processing tools like GIMP, ImageMagick, unpaper, pdf2djvu, etc.

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freedomPusher@sopuli.xyz

How to obtain the density (DPI / PPI) of a PGM file -- anyone know? ImageMagick does not cut it. (mander.xyz)

submitted 5 months ago* (last edited 5 months ago) by plantteacher@mander.xyz to c/paperless@sopuli.xyz

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Running this gives the geometry but not the density:

$ identify -verbose myfile.pgm | grep -iE 'geometry|pixel|dens|size|dimen|inch|unit'

There is also a “Pixels per second” attribute which means nothing to me. No density and not even a canvas/page dimension (which would make it possible to compute the density). The “Units” attribute on my source images are “undefined”.

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