message: Fix in Image to_mat
diff: @@ -38,7 +38,7 @@ inline cv::Mat to_mat(const Image4u& image)
  {
  cv::Mat opencv_matrix(image.rows, image.cols, CV_8UC4);
  for (int c = 0; c < image.cols; ++c) { // size_t
  - for (int r = 0; r < image.cols; ++r) {
  + for (int r = 0; r < image.rows; ++r) {
  //auto vals = image(r, c);
  opencv_matrix.at<cv::Vec4b>(r, c) = cv::Vec4b(image(r, c)[0], image(r, c)[1], image(r, c)[2], image(r, c)[3]);
  }
  