OpenCV自带颜色表

//图片路径
  QString appPath = QCoreApplication::applicationDirPath();
  imagePath = appPath + "/A.jpg";
  //读取图像
  img = cv::imread(imagePath.toStdString());
  if (img.empty())
    return;
  cv::namedWindow("input", cv::WINDOW_AUTOSIZE);
  cv::Mat dst;
  int color_map = COLORMAP_AUTUMN;
  while (true)
  {
    int c = cv::waitKey(2000);
    if (c == 27) {
      break;
    }
    applyColorMap(img, dst, color_map%21);
    color_map++;
    cv::imshow("input", dst);
  }
  cv::waitKey(0);
  cv::destroyAllWindows();