OpenCV 3.1 imwrite()函数写入异常问题解决方法

#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace std;
using namespace cv;

int main()
{
    Mat SrcImage = imread("1.jpg");
    imwrite("读入的图片.png", SrcImage);
    imshow("原图", SrcImage);
    waitKey(0);
    return 0;
}

 #include <opencv2/opencv.hpp>

    using namespace cv;
    using namespace std;

    void createAlphaMat(Mat &mat)
    {
        CV_Assert(mat.channels() == 4);
        for (int i = 0; i < mat.rows; ++i) {
            for (int j = 0; j < mat.cols; ++j) {
                Vec4b& bgra = mat.at<Vec4b>(i, j);
                bgra[0] = UCHAR_MAX; // Blue
                bgra[1] = saturate_cast<uchar>((float (mat.cols - j)) / ((float)mat.cols) * UCHAR_MAX); // Green
                bgra[2] = saturate_cast<uchar>((float (mat.rows - i)) / ((float)mat.rows) * UCHAR_MAX); // Red
                bgra[3] = saturate_cast<uchar>(0.5 * (bgra[1] + bgra[2])); // Alpha
            }
        }
    }

    int main(int argv, char **argc)
    {
        // Create mat with alpha channel
        Mat mat(480, 640, CV_8UC4);
        createAlphaMat(mat);

        vector<int> compression_params;
   compression_params.push_back(IMWRITE_PNG_COMPRESSION);
   compression_params.push_back(9);

        try {
            imwrite("alpha.png", mat, compression_params);
        }
        catch (cv::Exception& ex) {
            fprintf(stderr, "Exception converting image to PNG format: %s\n", ex.what());
            return 1;
        }

        fprintf(stdout, "Saved PNG file with alpha data.\n");
        return 0;
    }

#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace std;
using namespace cv;

int main()
{
    Mat SrcImage = imread("1.jpg");
    vector<int> compression_params;
    compression_params.push_back(IMWRITE_PNG_COMPRESSION);
    compression_params.push_back(9);
    imwrite("读入的图片.png", SrcImage, compression_params);
    imshow("原图", SrcImage);
    waitKey(0);
    return 0;
}