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Load image with default depth using the macro CV_LOAD_IMAGE_ANYDEPTH like,

  const cv::Mat src = cv::imread(filename, CV_LOAD_IMAGE_ANYDEPTH);

And check the channel like,

  std::cout<<src.channels();

Load image with default depth using the macro CV_LOAD_IMAGE_ANYDEPTH like,

  const cv::Mat src = cv::imread(filename, CV_LOAD_IMAGE_ANYDEPTH);

And check the number of channel using Mat::channels like,

  std::cout<<src.channels();