code: func Sharpness(sharpness uint) OptionsFunc {
  	return func(w *Waveform) error {
  		return w.setSharpness(sharpness)
  	}
  }
docs: // Sharpness generates an OptionsFunc which applies the input sharpness
  // value to an input Waveform struct.
  //
  // This value indicates the amount of curvature which is applied to a
  // waveform image, scaled on its X-axis.  A higher value results in steeper
  // curves, and a lower value results in more "blocky" curves.