docs: public static <Input extends ImageGray<Input>,Output extends ImageGray<Output>>
  	void distortPL(Planar<Input> input , Planar<Output> output ,
  				   ImageDistort<Input,Output> distortion )
  	{
  		for( int band = 0; band < input.getNumBands(); band++ )
  			distortion.apply(input.getBand(band),output.getBand(band));
  	}