xscreensaver-getimage uses gdk_pixbuf_new_from_file() to load images
(which is a format-agnostic routine that knows nothing about JPEG per
se). The only sane way to solve this is for either: GTK to auto-
rotate the images; or for GTK to tell the caller that the image
should be rotated. That information is not currently available via GTK.
I reported a bug about this in Feb 2005, against GTK:
http://bugzilla.gnome.org/show_bug.cgi?id=168231
I expect it to languish there forever.
In the meantime, you can losslessly auto-rotate all of your images
pretty easily:
http://www.jwz.org/hacks/rotimg
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