docs: public void setImage( II grayII , Planar<II> colorII ) {
  		InputSanityCheck.checkSameShape(grayII,colorII);
  		if( colorII.getNumBands() != numBands )
  			throw new IllegalArgumentException("Expected planar images to have "
  					+numBands+" not "+colorII.getNumBands());
  
  		this.grayII = grayII;
  		this.colorII = colorII;
  	}