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I am working like this-->

        cv::merge(channels, added3);                   (1)
        added3.forEach<Pixel>(Operator());          (2)
        cv::extractChannel (added3, op1, 0 );         (3)

Then , both (1) & (2) has BGR format, but in (3) if I put index = 0 ( index of channel to extract ) then will I be extracting the Blue Channel only right??