本标准规定了参考白信号，以及由HDTV显示器产生的绝对亮度水平和色度，包括公差，HDTV显示器再现符合SMPTE ST 274或SMPTE ST 296编码规范的参考白信号。本文定义的参考白度和色度旨在在受控环境中进行临界观察。它们不适用于某些应用，例如在工作室地板上或明亮环境光下使用的显示器。

This standard specifies a Reference White signal, and the absolute luminance level and chromaticity, including tolerances, that is to be produced by an HDTV display reproducing such a Reference White signal conforming to the encoding specifications of SMPTE ST 274 or SMPTE ST 296. The reference white level and chromaticity defined herein are intended for critical viewing in a controlled environment. They are not appropriate for some applications, such as displays used on a studio floor or in bright ambient light.