code: public static <T extends ImageGray<T>> void maximum(Planar<T> input, T output) {
  		maximum(input, output, 0, input.getNumBands() - 1);
  	}
docs: Computes the maximum for each pixel across all bands in the {@link Planar} image.
  
  @param input Planar image
  @param output Gray scale image containing average pixel values