[Introduction to OpenCV] Load, Modify, and Save an Image

https://docs.opencv.org/2.4/doc/tutorials/introduction/load_save_image/load_save_image.html#load-save-image

Load, Modify, and Save an Image — OpenCV 2.4.13.7 documentation

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace std;
using namespace cv;

int main() {
    Mat img;
    img = imread("chemnitz.jpg",IMREAD_COLOR);
    if(!img.data){
        cout<<"Could not open or find the image"<<endl;
        return -1;
    }
    Mat gray;
    cvtColor(img, gray, COLOR_BGR2GRAY);
    imwrite("/Users/kanakim/Coding/Opencv/chemnitz_gray.jpg", gray);
    namedWindow("Chemnitz", WINDOW_AUTOSIZE);
    namedWindow("Gray Chemnitz", WINDOW_AUTOSIZE);
    
    imshow("Chemnitz", img);
    imshow("Gray Chemnitz", gray);
    
    waitKey(0);
    return 0;
}

 

-cvtColor ( source image, destination image, kind of transformation will be performed ) 

: 소스이미지를 BGR에서 원하는 형식으로 변환후 destination 이미지로 만든다 

-imwrite( "path", image )

: 소스 이미지를 해당 경로에 저장