fcv::imwrite("xxx.jpg", mat)时图片过大 about flycv HOT 4 CLOSED

fcv::Mat fcv_img = fcv::imread(image_path);
int width = fcv_img.width();
int height = fcv_img.height();
int channels = fcv_img.channels();
printf("image width=%d, height=%d, channels=%d\n", width, height, channels);
fcv::imwrite("fcv.jpg", fcv_img); // 17MB

cv::Mat cv_img(cv::Size(width, height), CV_8UC3);
memcpy(cv_img.data, fcv_img.data(), width * height * channels * sizeof(uint8_t));
cv::imwrite("cv.jpg", cv_img); // 634KB