“…We describe the process of selecting a suitable CRM mode for a color image from six mapping modes (from M 1 to M 6 ) using Algorithm 1. First, we calculate the Pearson correlation coefficients between the three channels according to Equation ( 6) and store the results in set K. Then, we calculate the maximum value K max and the second largest value K smax in set K. Subsequently, we determine the channels ch 1 and ch 2 corresponding to K max and the channels ch 3 and ch 4 corresponding to K smax based on Equation (7). After that, we search for the mappings M δ(1) and M δ(2) that satisfy f 1 (ch 1 ) = ch 2 or f 1 (ch 2 ) = ch 1 in the six mapping modes, where δ(1) ∈ {1, 2, 3, 4, 5, 6}, δ(2) ∈ {1, 2, 3, 4, 5, 6}, and δ(1) ̸ = δ (2).…”