some software allows the JPG to specify its orientation while actually being stored in a different orientation, but not all software respects those flags.
so like, if your picture is sideways coming out of the camera, and you told some photo program or another to 'rotate it 90 degrees', not all those programs actually decode, rotate and reencode the image, some will just set the rotation flags in the header... So if the display software doesn't honor those flags, whooops.
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