Using Imagemagick, how do I crop out the white background?

Question

Let's say I have a directory full of flags (200 or so). Each flag has this border... 12px up and down and 1px left and rigtht.... like so:

enter image description here

How can I use imagemagick to like... crop every single .PNG image from 64x64 to 60x40

Note that your background is not white, but transparent, in the image included in the question. — mmgp, Dec 31 '12 at 14:12
http://askubuntu.com/questions/97695/is-there-a-lightweight-tool-to-crop-images-quickly || PHP custom color: http://stackoverflow.com/questions/9567816/trimming-images-with-imagick || http://superuser.com/questions/654557/how-to-auto-trim-scanned-images-using-imagemagick-or-graphicsmagick — Ciro Santilli OurBigBook.com, Oct 05 '15 at 22:12

score 11 · Accepted Answer · answered Dec 31 '12 at 08:03

11

You have the automatic crop: mogrify -trim flag.png. If it does not do the exact magic you want, use crop: mogrify -crop 60x40+2+12 flag.png (That is 2 pixels left).

answered Dec 31 '12 at 08:03

kmkaplan

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Note: `mogrify` is the in-place version of `convert`. – Ciro Santilli OurBigBook.com Oct 05 '15 at 22:04
1

`-fuzz N%` can also help with `-trim` in case the back ground color isn't exactly all one collor. – keithpjolley Nov 26 '22 at 14:31

Using Imagemagick, how do I crop out the white background?

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