> Using GIMP to rotate JPEG images is actually a bad idea since GIMP
> would have to recompress the file, introducing a quality loss. There
> are tools that allow to losslessly rotate JPEG images, even
> automatically provided that your camera has an orientation sensor and
> adds that info the image's EXIF data. jpegtran and exiftran are such
> tools.

IIRC, gimp knows lossless rotation since version 2.0. I had
to use it often and avoided gimp prior to this version. You
may realize the speed with which gimp rotates ... reencoding
has gone :)

Regards, Frank

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