code: def THUMBNAIL_OPTIONS(self):
          
          from django.core.exceptions import ImproperlyConfigured
  
          size = self._setting('DJNG_THUMBNAIL_SIZE', (200, 200))
          if not (isinstance(size, (list, tuple)) and len(size) == 2 and isinstance(size[0], int) and isinstance(size[1], int)):
              raise ImproperlyConfigured("'DJNG_THUMBNAIL_SIZE' must be a 2-tuple of integers.")
          return {'crop': True, 'size': size}
docs: Set the size as a 2-tuple for thumbnailed images after uploading them.