public void importTileBitmap(String imgFilename, TileCutter cutter, boolean createTiles) throws Exception
public void importTileBitmap(String imgFilename, TileCutter cutter) throws IOException
    public void importTileBitmap(String imgFilename, TileCutter cutter,                                 boolean createTiles) throws Exception    {        // IOException will propagate upwards when file cannot be found        tilebmpFile = new File(imgFilename);        tilebmpFileLastModified = tilebmpFile.lastModified();        BufferedImage tilebmp = ImageIO.read(tilebmpFile);        if (tilebmp == null) {            throw new Exception("Failed to load " + tilebmpFile);        }        importTileBitmap(tilebmp, cutter, createTiles);    }