rotate in gimp/darktable

[Michael]

One of my indoor panoramas worked out except it is vertical. So I opened it
up in Gimp and rotated it. The portion that is where the original image was
is rotated and visible. There is a gray chekerboard where the image was
before I rotated it. I guess this means it didn't rotate the canvas. How do
you rotate the canvas as well?

-- 
:-)~MIKE~(-:
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