+ thumbnail = optparse.OptionGroup(parser, 'Thumbnail images')
+ thumbnail.add_option(
+ '--write-thumbnail',
+ action='store_true', dest='writethumbnail', default=False,
+ help='write thumbnail image to disk')
+ thumbnail.add_option(
+ '--write-all-thumbnails',
+ action='store_true', dest='write_all_thumbnails', default=False,
+ help='write all thumbnail image formats to disk')
+ thumbnail.add_option(
+ '--list-thumbnails',
+ action='store_true', dest='list_thumbnails', default=False,
+ help='Simulate and list all available thumbnail formats')
+