Introduction to opencv (II): image color space conversion and image saving

To facilitate the description of different introductory examples , Add the following example classes ：

class OpencvExample
{
    
public:
	void Example_ColorSpace(Mat &image);

private:

};

//example.h
#pragma once
#include <opencv2/opencv.hpp>

using namespace cv;

class OpencvExample
{
    
public:
	void Example_ColorSpace(Mat &image);

private:

};

//example.cpp
#include "example.h"

void OpencvExample::Example_ColorSpace(Mat &image)
{
    
	Mat gray, hsv;

	cvtColor(image,hsv,COLOR_BGR2HSV);// Color space conversion 
	cvtColor(image,gray,COLOR_BGR2GRAY);

	imshow("HSV", hsv);
	imshow(" Grayscale ", gray);
	imwrite("E:/test/opencvexample/tmp/hsv.png", hsv); // Save the picture 
	imwrite("E:/test/opencvexample/tmp/gray.png", gray);
}

//main.cpp
#include <opencv2/opencv.hpp>
#include <iostream>
#include "example.h"

using namespace cv;
using namespace std;

int main()
{
    
	Mat src = imread("D:/images/gender.jpg");
	OpencvExample classExample;
	if (src.empty())
	{
    
		printf("Can't load image\n");
		return -1;
	}

	namedWindow("InPut", WINDOW_FREERATIO);
	imshow("InPut", src);
	
	classExample.Example_ColorSpace(src);// Color space conversion and save the converted image 

	waitKey(0);  // Unit millisecond  0 Unrestricted blocking 
	destroyAllWindows();
}