code: def get_idcard_photo(self, regid, size="medium"):
          
          if not self.valid_uwregid(regid):
              raise InvalidRegID(regid)
  
          size = str(size)
          if (not re.match(r"(?:small|medium|large)$", size) and
                  not re.match(r"[1-9]\d{1,3}$", size)):
              raise InvalidIdCardPhotoSize(size)
  
          url = "{}/{}-{}.jpg".format(PHOTO_PREFIX, regid.upper(), size)
  
          headers = {"Accept": "image/jpeg"}
  
          if self.actas is not None:
              if not self.valid_uwnetid(self.actas):
                  raise InvalidNetID(self.actas)
              headers["X-UW-Act-as"] = self.actas
  
          response = DAO.getURL(url, headers)
  
          if response.status != 200:
              raise DataFailureException(url, response.status, response.data)
  
          return streamIO(response.data)
docs: Returns a jpeg image, for the passed uwregid. Size is configured as:
              "small" (20w x 25h px),
              "medium" (120w x 150h px),
              "large" (240w x 300h px),
              {height in pixels} (custom height, default aspect ratio)