code: def writetitle(self, titlestring, colour = None):
          
          
          self.checkforpilimage()
          colour = self.defaultcolour(colour)
          self.changecolourmode(colour)
          self.makedraw()
          
          self.loadtitlefont()
          
          imgwidth = self.pilimage.size[0]
          imgheight = self.pilimage.size[1]
          textwidth = self.draw.textsize(titlestring, font = self.titlefont)[0]
          textxpos = imgwidth/2.0 - textwidth/2.0
          textypos = imgheight - 30
          
          self.draw.text((textxpos, textypos), titlestring, fill = colour, font = self.titlefont)
          
          if self.verbose :
              print "I've written a title on the image."
docs: We write a title, centered below the image.