Kurt Masur, the music director emeritus of the New York Philharmonic, who was credited with transforming the orchestra from a sullen, lackluster ensemble into one of luminous renown, died on Saturday in Greenwich, Conn. He was 88. The death was announced by the Philharmonic. Mr. Masur (pronounced mah-ZOOR) was the Philharmonic's music director from 1991 to 2002. When he took its helm, the orchestra was roundly considered to be a world-class ensemble in name only, its playing grown slipshod, its players fractious and discontented, its recording contracts unrenewed.