code: public short getPixelValue(BufferedImage image, int x, int y) {
  		validateImageType(image);
  		WritableRaster raster = image.getRaster();
  		short pixelValue = getPixelValue(raster, x, y);
  		return pixelValue;
  	}
docs: Get the pixel value as an "unsigned short"
  
  @param image
  tile image
  @param x
  x coordinate
  @param y
  y coordinate
  @return "unsigned short" pixel value