#include "CImg.h"
using namespace cimg_library;
int main() {
   CImg<unsigned char> c7("7.png");
   CImg<unsigned char> c9("9.png");
   CImg<unsigned char> cjack("jack.png");
   CImg<unsigned char> row;
   row = c7.append(cjack,'y').append(c9,'y');
   row.display();
}

CImg<unsigned char> col;
   col = c7.append(cjack,'x').append(c9,'x');
   col.display();