- YJK方式とは -- http://ngs.no.coocan.jp/doc/wiki.cgi/datapack?page=9%BE%CF+YJK%CA%FD%BC%B0 R = Y + J G = Y + K B = (5/4)Y - (1/2)J - (1/4)K Y = (1/2)B + (1/4)R + (1/8)G J = R - Y K = G - Y