public File writeImage(BufferedImage img, String name) {
		if (img == null || name == null || name.isEmpty()) return null;
		if (!outputFolder.exists()) outputFolder.mkdirs();

		File file = new File(outputFolder, String.format("%s.png", name));
		int i = 1;
		while (file.exists()) {
			file = new File(outputFolder, String.format("%s_%s.png", name, String.valueOf(i)));
			i++;
		}

		try {
			ImageIO.write(img, "png", file);
			return file;
		} catch (Exception ex) {
			ex.printStackTrace();
			return null;
		}
	}