A key for the image orientation. The associated value is an integer value packaged as an NSNumber object. Valid values are in range 1...8 and follow the EXIF specification. The value is disregarded when the kCIIgnoreImageOrientationKey flag is set. You can change the orientation of the image by overriding this value. By changing this value you can easily rotate an image in 90-degree increments.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)