OpenCV保存图片的时候出现了这个问题，代码没问题，可以运行，不知道是哪里出错了

Question

#include<opencv2/opencv.hpp>

using namespace cv;

int main()
{
    Mat scr, s, t;
    scr = imread("E:/OpenCV/OpenCV/1.png");
    imshow("原图", scr);
    cvtColor(scr,s, COLOR_BGR2HSV);
    cvtColor(scr,t, COLOR_BGR2GRAY);
    imshow("HSV", s);
    imshow("灰度", t);
    //imwrite("E:/OpenCV/OpenCV",s);
    imwrite("E:/OpenCV",t);
    waitKey(0);
    return 0;
}

Answer 1

imwrite("E:/OpenCV/t.bmp",t);要写到具体的图图片名加图片后缀才行