how to create code to Otsu's threshold using channel of color?

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Oman Wisni
Oman Wisni el 18 de Sept. de 2018
I want to threshold the image, I have green channel and saturation channel, that channel already I multiply, then I want to threshold using Otsu's method, but I can't do that cause in the example using grayscale. So what I do to continue my program?

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