code: def ggpht_s1600_extender(pipeline_index,
                           finder_image_urls,
                           extender_image_urls=[],
                           *args, **kwargs):
      
  
      now_extender_image_urls = []
  
      search_re = re.compile(r'/s\d+/', re.IGNORECASE)
  
      for image_url in finder_image_urls:
          if 'ggpht.com/' in image_url.lower():
              if search_re.search(image_url):
                  extender_image_url = search_re.sub('/s1600/', image_url)
                  now_extender_image_urls.append(extender_image_url)
  
      output = {}
      output['extender_image_urls'] = extender_image_urls + now_extender_image_urls
  
      return output
docs: Example:
      http://lh4.ggpht.com/-fFi-qJRuxeY/UjwHSOTHGOI/AAAAAAAArgE/SWTMT-hXzB4/s640/Celeber-ru-Emma-Watson-Net-A-Porter-The-Edit-Magazine-Photoshoot-2013-01.jpg
      to
      http://lh4.ggpht.com/-fFi-qJRuxeY/UjwHSOTHGOI/AAAAAAAArgE/SWTMT-hXzB4/s1600/Celeber-ru-Emma-Watson-Net-A-Porter-The-Edit-Magazine-Photoshoot-2013-01.jpg