SMPTE RP 431-2 PDF

This document defines the Reference Projector and its controlled environment, along with the acceptable tolerances around critical image parameters for Review Room and Theatre applications. The goal is to provide a means for achieving consistent and repeatable color image quality. The Reference Projector is a practical device. The nominal (Reference Projector) parameters are based on industry experience and have been demonstrated by commercially available projectors in controlled environments. Two levels of tolerances are specified, a tighter tolerance for Review Rooms¹ where critical color judgments are made, and a wider tolerance for satisfactory reproduction in Theaters used for general public exhibition.

¹ The use of the term "Review Room" includes the mastering environment where creative color decisions are made on a projected image.