Coba jelasin Lihat pula dari PostScript dong

(PLR3), plus its , is the de facto defining work, known as "The Red Book" on account of its covers. The first edition covered PostScript Level 1, the second edition covered a greatly expanded language known as PostScript Level 2, and includes documentation for Display PostScript as well. The third edition covers PostScript 3 (with this version, Adobe dropped "level" from the name) but no longer includes DPS.

is the corresponding introductory text, known as "The Blue Book" on account of its covers.