write_image_to_file.cpp

#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main( )
{
     //create an image ( 3 channels, 16 bit image depth, 650 high, 600 wide, (0, 50000, 50000) assigned for Blue, Green and Red plane respectively. )
     
     Mat img(650, 600, CV_16UC3, Scalar(0,50000, 50000)); 

     //check whether the image is loaded or not
     if (img.empty()) 
     {
          cout << "ERROR : Image cannot be loaded..!!" << endl;
          //system("pause"); //wait for a key press
          return -1;
     }

     //vector that stores the compression parameters of the image
     vector<int> compression_params; 

     //specify the compression technique
     compression_params.push_back(CV_IMWRITE_JPEG_QUALITY); 

     //specify the compression quality
     compression_params.push_back(98); 


     //write the image to file
     bool bSuccess = imwrite("TestImage.jpg", img, compression_params); 



     if ( !bSuccess )

    {

         cout << "ERROR : Failed to save the image" << endl;

         //system("pause"); //wait for a key press

    }

     //create a window with the name "MyWindow"
     namedWindow("MyWindow", CV_WINDOW_AUTOSIZE); 

     //display the image which is stored in the 'img' in the "MyWindow" window
     imshow("MyWindow", img); 

     //wait for a keypress
     waitKey(0);  

     //destroy the window with the name, "MyWindow"
     destroyWindow("MyWindow"); 

     return 0;
}