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This paper proposes a new method to predict color information of liquid crystal displays (LCDs) very accurately. Leaked light from black sub-pixels causes errors of the color prediction based on the individually measured RGB color information. We present a new method to remove the bad influence of the light leakage. We prove that this work can calculate the pure colorimetric information regardless of the shapes of opto-electronic transfer function (OETF) of LCDs. Without this technology, average errors of luminance (ΔY) and chromaticity coordinate (Δxy) over 30 colors were 0.58 cd/m2 and 0.04, respectively. When we applied the proposed method, however, average errors of ΔY and Δxy were 0.03 cd/m2 and 0.005, respectively. Experimental results show that our method can extract pure primary color information with extremely low errors.