[ITK] Bug in StatisticsImageFilter?

[gowith king]

I was trying to use itk.StatisticsImageFilter to check the outcome of my
image reader. but all the results are wrong.
reader1 = itk.ImageFileReader.IUC3.New()
reader1.SetFileName(inputImagetest)

rangetest=itk.StatisticsImageFilter.IUC3.New()
rangetest.SetInput(reader1)
print 'range: ', str(rangetest.GetMinimum())

result:
range:  255

obviously this is not true for my image : it is a binary image and has only
1 and 100 two values.

I am working on a python 2.7 wrapped ITK4 . if the python2 is incompatible
with itk?
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