make it work for different image range
make it work for different image range

lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox,lsqshr/Rivulet-Neuron-Tracing-Toolbox