Saves the wallpaper as the specified filename.

def paint(self):
        """
        Saves the wallpaper as the specified filename.

        """
        # nice blue color
        self.image = Image.new(mode='RGB', size=(self.width, self.height),
                               color=(47, 98, 135))
        self.paint_pattern()
        self.image.save(fp=self.filename)