else:
pin, pout = os.popen2('convert -size %sx%s - %s:-' % \
(pixel_width, ruler_height, ext))
pin.write(ruler.getxml())
pin.close()
else:
pin, pout = os.popen2('convert -size %sx%s - %s:-' % \
(pixel_width, ruler_height, ext))
pin.write(ruler.getxml())
pin.close()