OPencv实现图片灰度图转换

#include "stdafx.h"


#include
#include
#include
#include


#pragma comment(lib,"opencv_imgproc2413d.lib")  
#pragma comment(lib,"opencv_core2413d.lib")  
#pragma comment(lib,"opencv_highgui2413d.lib")  


int toGray(IplImage* img)
{
  IplImage* dst = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 1);//用原图像指针创建新图像
  if (NULL == dst)
  return -1;
  cvCvtColor(img, dst, CV_BGR2GRAY);//转换颜色空间 我试过，如果没有这一步 得到的图像将是全黑


  cvNamedWindow("Gray", CV_WINDOW_AUTOSIZE);
  cvShowImage("Gray", dst);
  cvSaveImage("Gray.jpg", dst, 0);//保存


  cvWaitKey(0);
  cvReleaseImage(&dst);
  cvDestroyWindow("Gray");


  return 1;
}


int main(int argc, char** argv)
{

    IplImage* img = cvLoadImage("C:/11.jpg",CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);    

    //如果想要载入最真实的图像，选择CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR。

    if (NULL == img)
    {
       printf("Image load fail!\n");
       return 2;
    }


   cvNamedWindow("RGB", CV_WINDOW_AUTOSIZE);
   cvShowImage("RGB", img);


  toGray(img);


  cvReleaseImage(&img);
  cvDestroyWindow("RGB");

}