Loads an image from an ImageDataObject.
If an error occures during reading the image, an exception is thrown.
If the image format is not supported, null is returned.
Parameters: obj - ImageDataObject to load the image from loaded image if loaded successfully,or null if no registered ImageReaderclaims to be able to read the image exception: java.io.IOException - if an error occurs during reading the image See Also:javax.imageio.ImageIO.read(java.io.InputStream)