File format conversions

File format can be changed by reading the file and then writing in desired format. In many cases the conversion works in distributed mode, too:

def convert_format():
        """
        Demonstrates file format conversion.
        """

        # Read image
        img = pi.read(input_file('simple_structures.vol'))

        # Write in any supported format
        pi.writeraw(img, output_file('vol_to_raw'))
        pi.writetif(img, output_file('vol_to_tif'))