CImg: open an image file

CImg provides several constructors for cimg_library::CImg type objects.

    std::string strFile = "lena.bmp";

    cimg_library::CImg<unsigned char> img1(strFile.c_str());

    cimg_library::CImg<unsigned char> img2;
    img2 = cimg_library::CImg<unsigned char>(strFile.c_str());
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