const unsigned char &r_U16_to_U8(int i)const { return table_r_U16_to_U8[i]; }
const unsigned char &g_U16_to_U8(int i)const { return table_g_U16_to_U8[i]; }
const unsigned char &b_U16_to_U8(int i)const { return table_b_U16_to_U8[i]; }
const unsigned char &r_U16_to_U8(int i)const { return table_r_U16_to_U8[i]; }
const unsigned char &g_U16_to_U8(int i)const { return table_g_U16_to_U8[i]; }
const unsigned char &b_U16_to_U8(int i)const { return table_b_U16_to_U8[i]; }