code: def monochromaticWavelength(img):
      '''
      TODO##########
      '''
      # peak wave lengths: https://en.wikipedia.org/wiki/RGB_color_model
      out = _calc(img)
  
      peakWavelengths = (570, 540, 440)  # (r,g,b)
  #     s = sum(peakWavelengths)
      for n, p in enumerate(peakWavelengths):
          out[..., n] *= p
      return out.sum(axis=2f monochromaticWavelength(img):
      '''
      TODO##########
      '''
      # peak wave lengths: https://en.wikipedia.org/wiki/RGB_color_model
      out = _calc(img)
  
      peakWavelengths = (570, 540, 440)  # (r,g,b)
  #     s = sum(peakWavelengths)
      for n, p in enumerate(peakWavelengths):
          out[..., n] *= p
      return out.sum(axis=2)
docs: TODO##########