【C++】OpenCV4-颜色空间的转换

#include <opencv2/opencv.hpp>
#include <iostream>
using namespace std;
using namespace cv;
int main() {
  Mat img = imread("C:/img/3.jpg");
  Mat img32;

  img.convertTo(img32, CV_32F, 1 / 255.0, 0);

  Mat HSV, HSV32;

  cvtColor(img, HSV, COLOR_BGR2HSV);
  cvtColor(img32, HSV32, COLOR_BGR2HSV);

  Mat gray0, gray1;
  cvtColor(img, gray0, COLOR_BGR2GRAY); //BGR和RGB的区别
  cvtColor(img, gray1, COLOR_RGB2GRAY);

  return 0;
}