This script generates two adjustment layers from the two layers on the top, A is the original image layer, B the modified (e.g. sharpened) one on top:
A - B = C
B - A = D
A - C + D = B
Now you can apply further editing and "switch on/off" the adjustment by switching the visibility of the subtractive and the additive layer. Also you can change the modification intensity by changing the intensity of these two layers.
Copy it into the scripts folder from GIMP, you will find it then under Layer -> Adjustment Layers:
http://docs.gimp.org/2.6/en/install-script-fu.html
Finally a big thank you to Shelly and Roy from the Flickr GIMP group:
http://www.flickr.com/photos/shelly-and-roy/
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