waitForUser("Select a ROI to sample for normalization.");
Stack.getPosition(channel, slice, frame);
//mlevel, channel, slice, frame, threshold group to return, string true or falsse 
//for whether to restrict calculation to the roi selected
newmin=call("com.MultiOtsu.Multi_OtsuThreshold.computeMin",2,3,slice,1,1,"true");
print(newmin);
Stack.setChannel(3);
setMinAndMax(newmin, newmin*2);