//imageJ array is zero ordered FYI
	channel=getArgument();
	Stack.getActiveChannels(activeChan);		
	
	if (substring(activeChan,channel-1,channel)=="1"){
	   activeChan=substring(activeChan,0,channel-1)+"0"+substring(activeChan,channel,lengthOf(activeChan));	     	   //if 1 is there change that to a 0 and reverse
	} else {
	  activeChan=substring(activeChan,0,channel-1)+"1"+substring(activeChan,channel,lengthOf(activeChan));	     	   
	}	
	Stack.setActiveChannels(activeChan);