def do_start(self, arg):
        if self.system:
            print ('Shutting down previous ActorSystem')
            self.system.shutdown()
            del self.system
            self.system = None
        if arg:
            base = arg.split()[0]
            capspec = ' '.join(arg.split()[1:])
            caps = eval(capspec) if capspec else {}
            print ('Starting %s ActorSystem\nCapabilities: %s'%(base, str(caps)))
            try:
                self.system = ActorSystem(base, caps)
                print ('Started %s ActorSystem'%base)
            except ImportError:
                print ('***ERROR starting ActorSystem with specified Base: %s'%base)
                import traceback
                traceback.print_exc()
            except ActorSystemException as ex:
                print ('***ERROR from Actor System: %s'%str(ex))
        else:
            self.system = ActorSystem()
            print ('Started default ActorSystem')
Use the `ContrastMouseMode` to adjust the transfer function
dataset/ETHPy150Open godaddy/Thespian/thespian/shell.py/ThespianShell.do_start--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/viewers/image/qt/viewer_widget.py/StandaloneImageWidget._set_norm