'Native height of this image, calculated from its height in pixels and
vertical dots per inch (dpi).'

@property
def default_cy(self):

    px_height = self.image.px_height
    horz_dpi = self.image.horz_dpi
    height_in_emu = ((914400 * px_height) / horz_dpi)
    return Emu(height_in_emu)
