This can be done in Gimp using the folowing:
1. open the pano in gimp
2. make a copy of the Layer
3. Use the selection tool to make the selection of the image to copy down
4. use the "scale Tool" Ctrl + T drag the 'marching ants' from top of image down to where the tripod legs appear. Do not allow any part of the tripod within the selection.
5. this is where it got muddy to me because I don't use Gimp....
6. drag the top edge of the transform box right down to the bottom of the image to cover the tripod. (this in Gimp didn't work the same as Photoshop)
But in essence what should happen is you grab the "top - middle" of the image and drag it straight down and it (in Photoshop... covers the bottom part of the image with the reversed top"
It didn't do this in Gimp (Maybe we have a Gimp Power User that knows how to do this)
7. the next steps are down to what you prefer, ie flatten the image or save as layers etc, but whatever you do, the two layers need to be combined.
Save the image under a different name (as to not replace your original)
Lee Scott - Nikon D3/D300/D5000 - |shaved Nikkor 10.5 mm| Manfrotto 055XPROB tripod /322RC2 Grip - Mrotator TCS |CS5 | PW7 & TW6.5 Pro
To err is human ... to not try is just plain lazy