selecting n number of the second reference color image signals from the m number of {TAIL ~ second reference color image signals}, the selected n number of the second reference color image signals being nearer in spatial position to the lattice point than non selected ones of {HEAD ~ the second reference color image signals}; and 
selecting n number of the second reference color image signals from the m number of { TAIL ~ second reference color image signals } , the selected n number of the second reference color image signals being nearer in spatial position to the lattice point than non selected ones of { HEAD ~ the second reference color image signals } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH