*** This bug is a duplicate of bug 486862 ***
    https://bugs.launchpad.net/bugs/486862

This is apparently a fundamental problem of lossless rotation. From the JPEG 
FAQ:
> In particular it is possible to do 90-degree rotations and
> flips losslessly, if the image dimensions are a multiple of the file's
> block size (typically 16x16, 16x8, or 8x8 pixels for color JPEGs).

You see the same result if you use for example the jpegtran tool, so it
is not eog specific. Still, I think it is a bug as eog should warn the
user and maybe offer to do a lossy rotation (i.e. reencoding) instead.
I'll link a (rather old...) upstream bug about the same issue,
discussions should best take place there.

BTW, if you rotate the image back, you also get your original image back
̣-- after all the rotation *is* lossless.

** Changed in: eog (Ubuntu)
       Status: New => Confirmed

-- 
rotating with eog does shift (wrap around) image if width or height is not a 
multiple of 16
https://bugs.launchpad.net/bugs/657433
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