Two images to separate the part above T and the part below T

It is using adaptive threshold and dilates the sign-flipped error. Error is - I_cur  when it is above T; otherwise, error is 255-I_cur. It did not use the CAH order and without ETF promotion. 

(1) It shows white when  I_cur  is above T and the rest shows as (255-I, 255-I,0).

(2) It shows black when I is below T and the rest shows as (255-I, 255-I,0).