我无法遍历所有图像的像素，它正在遍历其中的一部分。 OpenCV

Question

I have the following code:

void white(Mat&src,Mat&dst){

    double h = src.cols;
    double w = src.rows;

    dst = src.clone();

    for (int i = 0; i < dst.rows; i++) {
        for (int j = 0; j < dst.cols; j++) {
            dst.at<uchar>(i, j) = 255;
        }
    }
}

My expected result is to get a completely white image, however, I get this result:

Input Image:

Output Image:

Answer 1

It's a color image. Each pixel consists of 3 values. You have to set each color channel

void white(Mat&src,Mat&dst){
  double h = src.cols;
  double w = src.rows;
  dst = src.clone();
  for (int i = 0; i < dst.rows; i++) {
    for (int j = 0; j < dst.cols; j++) {
      for (std::size_t c = 0; c < 3; ++c) {
        dst.at<Vec3b>(i, j)[c] = 255;
      }
    }
  }
}