Resize jpg
From wiki.network-crawler.de
with ubuntu and bash
sudo apt-get install imagemagick
resize by 50%
for i in *.JPG; do convert $i -resize 50% $(basename $i .JPG).jpg; done
resize by specific resolution
for i in *.JPG; do convert $i -resize 1024x768 $(basename $i .JPG).jpg; done
