GIMP Plugin Registry

In order to understand how this script works, we must focus on the selection mask, that is the channel related to the selection (you can view it either by activating Quick Mask or by saving the selection as a channel). Referring to this mask, the script eliminates every area that is composed from non-white pixels and is completely enclosed by a fence of white pixels; since the elimination consists in filling such areas of the mask with white, the corresponding holes of the selection will disappear.  read more »

This script simulates complete exposed 35mm film strips with frame numbers, lettering, overexposed sprocketholes and DX film edge barcodes.
Copy it into the scripts folder from GIMP, you will find it then under Filters -> Decor -> Photo with Sprocketholes.  read more »