public void test() { File f = new File(this.signatureFileName); try { BufferedReader br = new BufferedReader(new FileReader(f)); String s1 = br.readLine(); String s2 = br.readLine(); String base64s1 = s1.split(",")[1]; String base64s2 = s2.split(",")[1]; System.out.println("TestSignature.test base64s1 = " + base64s1); System.out.println("TestSignature.test base64s2 = " + base64s2); double result = ImageComparator.compareRGBUsingRMSE( Utils.base64ImgToIntArray(base64s1), Utils.base64ImgToIntArray(base64s2)); System.out.println("Distance is " + result); } catch (IOException e) { e .printStackTrace(); // To change body of catch statement use File | Settings | File // Templates. } }