code: public static GrayU8 loadPGM_U8(String fileName , GrayU8 storage )
  			throws IOException
  	{
  		return loadPGM_U8(new FileInputStream(fileName),storage);
  	}
docs: Loads a PGM image from an {@link InputStream}.
  
  @param fileName InputStream for PGM image
  @param storage (Optional) Storage for output image.  Must be the width and height of the image being read.
  If null a new image will be declared.
  @return The read in image
  @throws IOException Thrown if there is a problem reading the image