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### Code conversion in opencv C++

I am trying to convert this second answer code into c++ , What I did is not giving me appropriate result , here is my code :

{
int level_n = 2;
Mat p = Mat::zeros(img.cols*img.rows, 3, CV_32F);
vector<Mat> bgr;
cv::split(img, bgr);
//Divide each pixel color with 127 for level 2
for(int i=0; i<img.cols*img.rows; i++) {
p.at<float>(i,0) = bgr[0].data[i] / 127.0;
p.at<float>(i,1) = bgr[1].data[i] / 127.0;
p.at<float>(i,2) = bgr[2].data[i] / 127.0;
}
vector<Mat> Img2 = p[bgr];
Mat out;
cv::transform(img,out,p);
imshow ("output" , out);
}


What I didn't understand is how I put these colour's which I divided by 127 into Matrix , where I am going wrong?

Other way i am trying is

vector<Mat> bgr;
Mat blue , green , red;
cv::split(img, bgr);
blue = bgr[0]/127.0;
if (blue > 128)
{
blue = 255;
}
else
{
blue = 0;
}


same for red and green