diff --git a/lines.cpp b/lines.cpp
index e37fea1..b3e622f 100644
--- a/lines.cpp
+++ b/lines.cpp
@@ -28,7 +28,7 @@ int main(int argc, char *argv[])
 	char const *fname = "files/masckera.png";
 	if( 1<argc )
 		fname = argv[1];
-	if( 2<argc) {
+	if( 3<argc) {
 		std::cerr << "Too many arguments" << std::endl;
 		return EXIT_FAILURE;
 	}
@@ -135,8 +135,15 @@ int main(int argc, char *argv[])
 		if( (char)cv::waitKey(0) == 113 )
 			break;
 	}
-	img.release();
 #endif
+	if(2<argc) {
+		std::vector<int> params;
+		params.push_back(CV_IMWRITE_PNG_COMPRESSION);
+		params.push_back(9);
+		Mat dst;
+		img.convertTo(dst, CV_8UC3);
+		cv::imwrite(argv[2], dst, params);
+	}
 
 	return EXIT_SUCCESS;
 }