concatenate color histogram

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I have a question. I should compare two images based on their color histogram. I use opencv and c++. Is it correct to calculate the histograms free netflix of each individual channel (R, G, B), normalize each of them, android 9 concatenate them and calculate the distance of bhattacharya? tech news So I would have two matrices (each with 3 histograms inside) that I would compare. Is it correct?