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what is the proper way of using cvSplit function? I saw different version of it.
should it be
cvSplit(oriImg, r,g,b, NULL);or
cvSplit(oriImg, b,g,r, NULL);
Both of them are ok, it depends on the channel ordering. By default OpenCV uses BGR, so in this case it would be
cvSplit(oriImg, b,g,r, NULL);, but you can convert it to RGB and then use the other one.