int main( int argc, char** argv ) {
     IplImage* pImg; //声明IplImage指针   //载入图像，强制转化为Gray if( argc == 3 && (pImg = cvLoadImage( argv[1], 0)) != 0 ) {
           IplImage* pImg2 = cvCreateImage(cvGetSize(pImg), 				      pImg->depth, 				      pImg->nChannels);       cvCopy(pImg, pImg2, NULL);         cvSaveImage(argv[2], pImg2);//把图像写入文件         cvNamedWindow( "Image", 1 );//创建窗口       cvShowImage( "Image", pImg );//显示图像         cvWaitKey(0); //等待按键         cvDestroyWindow( "Image" );//销毁窗口       cvReleaseImage( &pImg ); //释放图像       cvReleaseImage( &pImg2 ); //释放图像 return 0; }   return -1; }