Function imwrite

source/matplot/util/common.cpp:670–673

    }

    void imwrite(const image_channels_t &A, const std::string &filename) {
        auto cimg_image = channels2cimg(A);
        cimg_image.save(filename.c_str());
    }

    image_channel_t rgb2gray(const image_channels_t &A) {
        image_channel_t img(A[0].size(), image_row_t(A[0][0].size()));