docs: def set_contrast(self, contrast):
          """
          Adjusts the image contrast.
  
          Contrast refers to the rate of change of color with color level.
          At low contrast, color changes gradually over many intensity
          levels, while at high contrast it can change rapidly within a
          few levels
  
          Args:
            contrast: float
              A number between 0 and 1.  Note that upon initialization the
              colormap has a default contrast value of 0.5.
  
          Returns: void
          """
          self._contrast = contrast
  
          self.x_spread = 2 * (1.0 - contrast)
          self.y_spread = 2.0 - 2 * (1.0 - contrast)
  
          self._build_cdict()