open cv rgb->grayscale

#include <iostream>

#include "cv.h"

#include "highgui.h"


using namespace std;


int main( int argc, char** argv )


{

//load color image specified by first argument

IplImage *source = cvLoadImage( argv[1]);


// create new image structure 

// for the grayscale output image

IplImage *destination = cvCreateImage( 

cvSize( source->width, source->height ), IPL_DEPTH_8U, 1 );





// set type CV_RGB2GRAY to convert 

// RGB image to grayscale 

cvCvtColor( source, destination, CV_RGB2GRAY );




// save grayscale image to a file specified by 

// second argument

cvSaveImage( argv[2], destination );

return 0;


}