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2015-10-06 10:47:12 -0500 answered a question How to extract red color plane in OpenCV C++

prefer to use void cv::extractChannel (InputArray src, OutputArray dst, int coi )

cv::Mat out; cv::extractChannel(in, out, 0) // Supposing RGB channel with red first out....

src: http://docs.opencv.org/master/d2/de8/group__core__array.html#gacc6158574aa1f0281878c955bcf35642