I agree, the problem is only with the iPhone, Canon, Nikon and maybe a few other cameras. But it will probably get worse as cameras & cell phones improve and prices go down.
There are a LOT of iPhones out there - and they're not going to go away. I'm not sure, but ios8 may have fixed the problem - but that's just speculation. I haven't seen enough photos that I'm SURE are ios8. That info gets stripped out of the jpg's in the resize, and I never see the original photos to be sure. And I don't have an iPhone to test.
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I'm guessing that you're going to need to write something to check if the image has the orientation metadata and then do something based on that to fix the image when we do image checking from the original upload.
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Please don't take this as an insult, but if I'm not mistaken, adding that "-auto-orient" early in the process might be an easy way to fix the problem for everyone - IF it works. And I'm not a good enough programmer anymore to find out. I haven't done any serious programming since CP/M days, when I wrote a text editor in 8080 assembler because I hated edlin so much, and couldn't afford to buy a screen oriented editor instead of the line oriented one that was built into CP/M.
Do the rotation first if the orientation metadata is there, and THEN figure out whether it needs to be resized, etc. and do the rest of the processing. I've seen quite a few complaints about this problem on our MB and elsewhere, and I think it occurs in 5, too. I have no idea how they do it, but a lot of other web sites DO automatically orient the photos properly, so it's obviously NOT impossible.