private File urlToImg(String urlImg) throws Exception {
		URL url=new URL(urlImg);
		URLConnection connection = null;

		connection = url.openConnection();
			
		InputStream in = null;
		in = connection.getInputStream();
		
		FileOutputStream fos = null;
	
		File factura = null;
		fos = new FileOutputStream(factura=new File("downloaded.jpg"));

		byte[] buf = new byte[512];
		while (true) {
		    int len = in.read(buf);
		    if (len == -1) 
		    	{break;}
		    fos.write(buf, 0, len);
		}
		in.close();fos.flush();fos.close();
		
		return factura;
	}

	private BufferedImage crearQR(String datos, int ancho, int altura) throws WriterException {
        BitMatrix matrix;
        Writer escritor = new QRCodeWriter();
        matrix = escritor.encode(datos, BarcodeFormat.QR_CODE, ancho, altura);
         
        BufferedImage imagen = new BufferedImage(ancho, altura, BufferedImage.TYPE_INT_RGB);
         
        for(int y = 0; y < altura; y++) {
            for(int x = 0; x < ancho; x++) {
                int grayValue = (matrix.get(x, y) ? 0 : 1) & 0xff;
                imagen.setRGB(x, y, (grayValue == 0 ? 0 : 0xFFFFFF));
            }
        }
         
        return imagen;        
    }


	private void concatenarFotos(String urlTemplateFactura){
		try {
	
			File facturaTemplate = urlToImg(urlTemplateFactura);
			
			BufferedImage biUno = ImageIO.read(facturaTemplate);//1240x1755
			BufferedImage biDos = crearQR("https://www.google.com/",200,200);
		
			BufferedImage biResultado = new BufferedImage(biUno.getWidth(), biUno.getHeight(), BufferedImage.TYPE_INT_ARGB);
		
			Graphics g = biResultado.getGraphics();
			g.drawImage(biUno, 0, 0, null); 
			g.drawImage(biDos, biUno.getWidth()/2, biUno.getHeight()-(biUno.getHeight()/4), null);
		
			
			//ImageIO.write(biResultado, "PNG", new File("resultado.png"));
			
			//~*~*~*~*~*~*~asigna la img generada como template del pdf:~*~*~*~*~*~*~
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ImageIO.write(biResultado, "gif", baos);
			this.image = Image.getInstance(baos.toByteArray());

			logger.info("----------------------Imagenes concatenadas correctamente----------------------");
		}
		
		catch(Exception e) {
			logger.info("----------------------Error al momento de concatenar las imgs----------------------");
			System.out.println(e.getMessage());
		}
	}