fprintf(stdout," 0: no MCT ; 1: RGB->YCC conversion ; 2: custom MCT.\n");
fprintf(stdout," If custom MCT, \"-m\" option has to be used (see hereunder).\n");
fprintf(stdout," By default, RGB->YCC conversion is used if there are 3 components or more,\n");
fprintf(stdout," 0: no MCT ; 1: RGB->YCC conversion ; 2: custom MCT.\n");
fprintf(stdout," If custom MCT, \"-m\" option has to be used (see hereunder).\n");
fprintf(stdout," By default, RGB->YCC conversion is used if there are 3 components or more,\n");