Open a terminal window or shell (who needs a GUI!?)
sudo apt-get install imagemagick
for f in *jpg
convert -resize 30% $f resized/$f
Easier than Photoshop, I reckon!
I needed this today for some photos I was uploading. Photos from recent cameras are huge and Australian bandwidth doesn’t cut it. So this really helps.
Obviously you only need to do the first line once. I found this in the Ubuntu forums but it took me a while to find the right combination of keywords in Google. View the original thread.
I needed to change jpg to JPG, because the camera used uppercase and Linux is case-sensitive. 30% was good for me but you may need to change that.
If you don’t understand this, ask me, I’m happy to help!