這一段程式碼實現的是分離與混合

注：影象分離後會將rbg各個資料傳入mv陣列中

#include<opencv2/opencv.hpp>
#include <iostream>
using namespace std;
int main()
{
    //影象的分離：
    cv::Mat photo = cv::imread("0003.jpg");
    cv::Mat output = cv::Mat(photo.size(), photo.type());
    std::vector<cv::Mat> mv;
    split(photo, mv);      
 

    imshow("Blue Channel", mv[0]);
    imshow("Green Channel", mv[1]);
    imshow("Red Channel", mv[2]);

    //影象合併：
    cv::Mat photo_alter_1, photo_alter_2, photo_alter_3;
    mv[1] = 0;
    mv[2] = 0;
    cv::merge(mv, photo_alter_1);
    imshow("altered_1", photo_alter_1);
    

    split(photo, mv);
 

    mv[1] = 0;
    mv[0] = 0;
    cv::merge(mv, photo_alter_2);
    imshow("altered_2", photo_alter_2);

    split(photo, mv);
    mv[0] = 0;
    mv[2] = 0;
    cv::merge(mv, photo_alter_3);
    imshow("altered_3", photo_alter_3);


    cv::waitKey(0);
}

關於影象混合（有點難）：

C++: void mixChannels(const Mat*src, size_t nsrcs, Mat* dst, size_t ndsts, const
 
 int* fromTo, size_t npairs)

void mixChannels(
const Mat* src, //輸入陣列或向量矩陣,所有矩陣的大小和深度必須相同。
size_t nsrcs, //矩陣的數量
Mat* dst, //輸出陣列或矩陣向量,大小和
深度必須與src[0]相同
size_t ndsts,//矩陣的數量
const int* fromTo,//指定被複制通道與要複製到的位置組成的索引對（字面意思）
size_t npairs //fromTo中索引對的數目
);

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

using namespace std;

int main()
{
    //影象的分離：
    cv::Mat photo = cv::imread("0002.jpg");
    cv::Mat output = cv::Mat(photo.size(), photo.type());
    std::vector<cv::Mat> mv;
    split(photo, mv);
    imshow("Blue Channel", mv[0]);
    imshow("Green Channel", mv[1]);
    imshow("Red Channel", mv[2]);

    //影象合併：
    cv::Mat photo_alter_1, photo_alter_2, photo_alter_3;
    mv[1] = 0;
    mv[2] = 0;
    cv::merge(mv, photo_alter_1);
    imshow("altered_1", photo_alter_1);


    split(photo, mv);
    mv[1] = 0;
    mv[0] = 0;
    cv::merge(mv, photo_alter_2);
    imshow("altered_2", photo_alter_2);

    split(photo, mv);
    mv[0] = 0;
    mv[2] = 0;
    cv::merge(mv, photo_alter_3);
    imshow("altered_3", photo_alter_3);

    //影象混合

    cv::Mat dst = cv::Mat::zeros(photo.size(), photo.type());
    int ft[] = { 0,1,2,0,1,2 };
    /*
    0變1 2變0 1變2
    0，1，2對應各個通道，略
    */
    mixChannels(&photo, 1, &dst, 1, ft, 3);
    cv::imshow("Mix", dst);


    cv::waitKey(0);

}