Rotated image displayed correctly on F-Spot/Nautilus but as not rotated on Firefox/Chrome/Windows

[Son]

Binary package hint: nautilus-image-converter

See the attached file for example.

On my computers (Ubuntu Lucid Lynx release candidate + Karmic Koala up-to-date), the rotated image is displayed as rotated on F-Spot/Nautilus/other basic image viewer, but is displayed as not-rotated on Chrome/Nautilus. When copied to a Windows partition, the image is shown as not rotated in the Windows built-in image viewer.

If the rotation is made using the Windows image viewer, everything is fine.

Can anyone help me to find out what's wrong?

Thanks in advance

[Radek Knap (raddik)]

I haven't pinned down the problem, but under Ubuntu Netbook Edition 10.04 rc Nautilius it looks unrotated (portrait). I've looked at this picture under XnView MP picture viewer and looking for some info about EXIF data.
This I think is the place you should investigate. Some cameras have a built in sensor for portrait/landscape and info about that goes to exif data stored in the picture. The same goes to progras dealing with images. While some use exif data to properly present pictures, other don't. You can also alter exif data to change the information about orientation of pictures without altering the picture pixel data.
And this could be a reason for such different behavior.