Am 17.09.2015 um 19:36 schrieb Bill Oliver:
On Thu, 17 Sep 2015, Timothy Murphy wrote:

Shaheen Bakhtiar wrote:

You can also write a little script for gimp if you don't want to do it
interactively.  See:

http://superuser.com/questions/216177/command-line-to-automatically-crop-an-image


Personally, I don't like scripting gimp, but to each his own.


billo

It's not a Gimp script mentioned there, but an ImageMagick command (convert).
By the way, there are nice tutorials on using ImageMagick from IBM (yes!), rather old, but not outdated:
http://www.ibm.com/developerworks/linux/library/l-graf/index.html
http://www.ibm.com/developerworks/linux/library/l-graf2/index.html