GIMP Plugin Registry

You define a dictionary type directly inside the plugin script stating the layers and the area of the image you want to cropp, and you can give a resize factor (variable newsize) for the whole image. You can choose between opening all created cropped images in gimp or saving them.

Just edit the default images dictionary to your needs or test the script on the example xcf file available at

http://freshflesh.de/files/croppparkour.zip

You should have some basic python knowledge to use this script!