elif operation == 'ancient_map':
# First, some error checking
if options.sea_color == "blue":
sea_color = (142, 162, 179, 255)
elif options.sea_color == "brown":
sea_color = (212, 198, 169, 255)
else:
usage("Unknown sea color: " + args[0] + " Select from [" + SEA_COLORS + "]")
if not options.world_file:
usage("For generating an ancient map is necessary to specify the world to be used (-w option)")
world = World.from_pickle_file(options.world_file)