docs: def set_bias(self, bias):
          """
          Adjusts the image bias.
  
          Bias determines where the color changes start.  At low bias, low
          intensities (i.e., low pixel values) will have non-zero color
          differences, while at high bias only high pixel values will have
          non-zero differences
  
          Args:
            bias: float
              A number between 0 and 1.  Note that upon initialization the
              colormap has a default bias of 0.5.
  
          Returns: void
          """
          self.x_offset += (bias - self._bias)
          self._bias = bias
  
          self._build_cdict()