Traceback (innermost last):
  Module ZPublisher.Publish, line 115, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 41, in call_object
  Module opencore.nui.wiki.view, line 378, in thumb
  Module PIL.Image, line 1305, in save
  Module PIL.JpegImagePlugin, line 390, in _save
IOError: cannot write mode P as JPEG