Below you will see a picture of beatiful pastry called \"simit\" from Turkey. It is taken from iPad 2, therefore it is a JPEG with dimensions 720*960.
The photo was probably taken holding the iPad in portrait mode, and therefore contains EXIF orientation information, which ImageIO ignores, but you can use other libraries, like Apache Sanselan to correctly handle it.
So the image itself is 960x720, but MacOS, ImgUR, Facebook etc correctly take the EXIF info into account.
And simit looks delicious :)