I recently needed a quick and dirty way to crop the bottom chunk of a large batch of scanned photos. Thanks to Linux and FOSS, this is possible with a fantastic tool known as imagemagick.
Simply install imagemagick to get the necessary tools
#Assuming you have a redhat based distro sudo yum install ImageMagick*
Once installed use the mogrify tool (part of ImageMagick) to quickly chop the bottom part off:
mogrify -chop 0x45+0+0 -gravity South *.jpg
The above example chops the bottom 45 pixels off of every picture in the directory you’re in. Thanks to this site for the info. Handy.