I should be able to make my photos upright

Summary: I'm going to call this a usability bug. It appears that each mobile device has its own notion of the orientation of photos; sadly, this doesn't appear to always be the way you took the photo. So pictures often come out sideways.

The ideal solution would be if we could detect and manage the orientation, based on the way the device was held when I took the shot. If we can't do that, we need a way to rotate images, probably in preview before we upload them.

LATER: metageek pointed out on LJ that EXIF data probably says something about the orientation. It looks like this library lets me get at the EXIF data in gory details, and this recipe shows how to rotate the image. So I think we have a theoretical solution.

Possibly even better, the client-side Load Image Library that we are already using (under the hood of File Upload) has EXIF parsing built into it, if we dig deeply enough. We already probably want to pause before uploading, to allow the user to add a caption, so we might pull apart the file-upload step and do some more sophisticated stuff using this.