code: def _control_sample(self, sample):
          ''' Control the asked sample is ok '''
          if sample > float(self.SAMPLE_LAST_PIXEL):
              return int(self.SAMPLE_LAST_PIXEL)
          elif sample < float(self.SAMPLE_FIRST_PIXEL):
              return int(self.SAMPLE_FIRST_PIXEL)
          else:
              return samplf _control_sample(self, sample):
          ''' Control the asked sample is ok '''
          if sample > float(self.SAMPLE_LAST_PIXEL):
              return int(self.SAMPLE_LAST_PIXEL)
          elif sample < float(self.SAMPLE_FIRST_PIXEL):
              return int(self.SAMPLE_FIRST_PIXEL)
          else:
              return sample
docs: Control the asked sample is ok