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I want to keep a collection of images (which arrive via RSS) on a shared network drive (for anyone to have SFW desktop backgrounds).

However, some of the images that arrive are absurdly small (85x75, for example).

How can I ensure that all images in the directory are of a minimum size (eg 1366x768)? I want to be able to maintenance on the directory so that too-small images are not kept.

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    askubuntu.com/a/155083/295286 Commented Apr 14, 2015 at 14:26
  • have you tried file XYZ ? Commented Apr 14, 2015 at 14:27
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    superuser.com/questions/275502/… Commented Apr 14, 2015 at 14:27
  • @Archemar I tried that, only gives filetype, that's all Commented Apr 14, 2015 at 14:28
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    @YoMismo right, so this wouldn't be useful if images the OP receives are in different format that png, right ? Commented Apr 14, 2015 at 14:41

3 Answers 3

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Use imagemagick :

identify -format "%w×%h\n" foo.png

or graphicsmagick :

gm identify -format "%w×%h" clipart-playback-buttons-d1e5.png

(graphicsmagick adds a newline by default)

Those print width×height, e.g. 85×75 or 4328×4278. Identify can show you other information of the image, too.

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  • this looks like just what I'm looking for - @Serg mentioned it in a comment off AskUbuntu, too Commented Apr 14, 2015 at 15:08
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You may try whether the picture data contain EXIF Information; in that case you can use exiftool, e.g.:

$ exiftool -S dscn0986.jpg dscn0986_th.jpg | grep ^Image ImageWidth: 1024 ImageHeight: 768 ImageSize: 1024x768 ImageWidth: 128 ImageHeight: 128 ImageSize: 128x128
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Depends on the system you are running of course. In Linux, you should be able to do 'file ' and see the size in the output which you can then parse and make decisions from.

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