'Displays this image. This method is mainly intended for
debugging purposes.
On Unix platforms, this method saves the image to a temporary
PPM file, and calls either the **xv** utility or the **display**
utility, depending on which one can be found.
On macOS, this method saves the image to a temporary BMP file, and
opens it with the native Preview application.
On Windows, it saves the image to a temporary BMP file, and uses
the standard BMP display utility to show it (usually Paint).
:param title: Optional title to use for the image window,
where possible.
:param command: command used to show the image'

def show(self, title=None, command=None):

    _show(self, title=title, command=command)
