iOS: Image get rotated 90 degree after saved as PNG representation data

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Starting with iOS 4.0 when the camera takes a photo it does not rotate it before saving, it

simply sets a rotation flag in the EXIF data of the JPEG.If you save a UIImage as a JPEG, it

will set the rotation flag.PNGs do not support a rotation flag, so if you save a UIImage as a

PNG, it will be rotated incorrectly and not have a flag set to fix it. So if you want PNG

images you must rotate them yourself, for that check this link.

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