Howto batch resize images with imagemagick
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Let's assume, you have a bunch of digital images, but you want to resize them into a handy format. Install ImageMagick and use the following command:
find . -iname "*.jpg" -exec convert -resize 800x800 {};
This will resize the images (with .jpg in their filenames) to a format where 800 is the largest dimension.
ATTENTION: This will resize your files. Your original files will be lost. Make sure to have a copy of the original files, if you want to keep them
