[nithinbekal]

Oh, sorry, my mistake.

I've been looking around to see if ImageMagick could do rotation without degrading quality. (I'd also asked a question about that elsewhere in this thread.) So I assumed that most devices use something similar even for displaying on the screen. It appears I assumed wrong. :)

I saw your other comment about axis-aligned rotation not being too computationally expensive. In that case, why aren't iPhones doing it by default? Wouldn't their computation power be comparable to that of most of the cameras that rotate the images? Or are cameras better equipped to handle such transformations?

[micampe]

Other cameras don't usually rotate the photos (I've had to fix this same bug myself before the iPhone existed). My guess is that they didn't notice it earlier because photos from cameras are more likely to go through some post processing that on the final export saves the image with the data already rotated.