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Is it possible to convert a grayscale image to contain a RGB channel? And thereby manipulate those, and give some color to an grayscale image?

I tried using cvtColor but, i seem to get an black image as output.

Is it possible to convert a grayscale image to contain a an RGB channel? And thereby manipulate those, and give some color to an grayscale image?

I tried using cvtColor but, i seem to get an black image as output.