> Cameras should have just rotated the actual image pixels when saving, instead of cheating. If that's too slow, implement it in hardware, or schedule a deferred process and don't let the images be exported until that's done.

What if I want to rotate an image by 90 degrees because my camera didn't correctly detect up & down?

To my understanding rotation is lossless, where as moving the data will incur quality loss (except for certain exceptions).