code: def simple_atmo_opstring(haze, contrast, bias):
      
      gamma_b = 1 - haze
      gamma_g = 1 - (haze / 3.0)
      ops = (
          "gamma g {gamma_g}, " "gamma b {gamma_b}, " "sigmoidal rgb {contrast} {bias}"
      ).format(gamma_g=gamma_g, gamma_b=gamma_b, contrast=contrast, bias=bias)
      return ops
docs: Make a simple atmospheric correction formula.