code: public int[] getUnsignedPixelValues(BufferedImage image) {
  		short[] pixelValues = getPixelValues(image);
  		int[] unsignedPixelValues = getUnsignedPixelValues(pixelValues);
  		return unsignedPixelValues;
  	}
docs: Get the pixel values of the buffered image as 16 bit unsigned integer
  values
  
  @param image
  tile image
  @return unsigned integer pixel values