I have the same problem with TIF files, wich are converted from Canon 5D
RAW files.

I can confirm, that the problem is somehow related to the EXIF, because
only these files are mirrored, wich was taken as portrait. I also not
sure, what Angel Abad said about the preview picture, because i don't
know, has the TIF file the FULL resolution preview picture in it or not.

I can say that this issue is affecting at least eof and also the
nautilus thumbnails too.

I made a test directory where i put 3 such an files, wich were mirrored.
At first, nautilus was not able to generate the thumbnails for them, it
just displaied the "TIF" icon. When i was opening these files, they all
was still in landscape (90 degree) (as i told, these pictures were all
takes as portrait) and all where mirrored over their real (in meaning of
taking the picture) real vertical axis.

So the next step i did, was: holding the Ctrl key, dragged an copy of
one file. At this moment, nautilus magically succeed to generating the
thumbnails for all the 4 files. The thumbnails were there, but they all
were in wrong orientation.

After that, i opened the copy file i made and i rotated it into correct
orientation and saved it. It's thumbnail was updated into correct
orientation (but still mirrored). But this is not all, things getting
weird:

without editing the others files, nautilus thumbnails started behave
different than eog. At the moment when i was opening the other file,
it's thumbnail changed to correct one: correct orientation and no
mirror. One by one, at the double click. But like i said, the eog
behaved differently, and there were all files still in incorrect
orientation and mirrored.

So, editing file x, made files y,z thumbnailing behave correct...

-- 
some .CR2 (RAW) pictures are displayed mirrored
https://bugs.launchpad.net/bugs/554036
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