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You can use cvtColor function to change color space. All color code conversions are here

Now in memory mat structure is here

I don't understand what you want array_buffer. You can use split to get B plane, G plane and R plane in three mat.

if mat is continuous in memory you don't need a loop :

memcpy(array_buffer, Mat_frame.ptr(0), Mat_frame.cols*Mat_frame.rows * sizeof(uint8_t)*3);