读入，修改和保存一幅图像_C++

接上一篇

#include "cv.h"#include "highgui.h"using namespace cv;using namespace std;int main(int argc,char *argv[]){Mat src,gray;src=imread("lena.jpg",CV_LOAD_IMAGE_COLOR);if (!src.data){cout<<"Cound not read the file!"<<endl;getchar();return -1;}cvtColor(src,gray,CV_RGB2GRAY);imwrite("../gray.jpg",gray);                            //其中../表示工程文件的上一级文件夹namedWindow("src");namedWindow("gray");imshow("src",src);imshow("gray",gray);waitKey(0);return 0;}

从中看到C++编程的方便性，在图像处理时，不用先创建图像空间

The functions can read/write images in the following formats:（格式支持）
BMP (.bmp), JPEG (.jpg, .jpeg), TIFF (.tif, .ti ), PNG(.png), PBM/PGM/PPM (.p?m), Sun Raster (.sr),JPEG 2000 (.jp2). Every format supports 8-bit, 1- or3-channel images. Some formats (PNG, JPEG 2000) support 16 bits per channel.