Resizing a directory of images

<h3 class="entry-title">Resizing a directory of images</h3>
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Requires the software packageImageMagick. An important item to note is that command mogrify modifies the file in place and does not create a copy.

mogrify -verbose -resize '40%' *.JPG



mkdir processed; for f in *.JPG; do ffmpeg -i $f -q:v 10 processed/$f; done

Source: Somewhere on stackoverflow.