gimp -i -b '(batch-whiteboard-clean "*.png")' -b '(gimp-quit 0)'
+# the batch-whiteboard-clean.scm script should go in: ~/.gimp-2.6/scripts
+
# from sites:
# http://matthew.mceachen.us/blog/how-to-clean-up-photos-of-whiteboards-with-gimp-403.html
# http://registry.gimp.org/node/19822