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I have just set up open cv4.1.0 with visual studio 2019 on windows 10. My simple code for loading the image is as under

main()

{ Mat imag;

   // LOAD image
   imag = imread("D:\\image1.png",0);   // Read the file "image1.png".

   if(imag.empty() )  // Check for invalid inputf
   {
          cout <<  "Could not open or find the image" << std::endl ;
          return -1;
   }

   //DISPLAY image
   namedWindow("Window1", WINDOW_AUTOSIZE); // Create a window for display.
   imshow("Window1", imag); // Show our image inside it.

   //SAVE image
   imwrite("result1.jpg",imag);// it will store the image in name "result.jpg"

   waitKey(5000);                       // Wait for a keystroke in the window
   return 0;

}