1.1本指南用于选择术语、测量尺度和仪器，以描述或评估反射或透射光的光泽度、不透明度、亮度、透明度和模糊度等外观特征。本指南不考虑与颜色有关的光谱变化，但本文所述的几何变量可能会对仪器测量的颜色值产生重要影响。本指南的范围一般，而不是仪器或材料的具体范围。

1.1 This guide is intended for use in selecting terminology, measurement scales, and instrumentation for describing or evaluating such appearance characteristics as glossiness, opacity, lightness, transparency, and haziness in terms of reflected or transmitted light. This guide does not consider the spectral variations responsible for color, but the geometric variables described herein can importantly affect instrumentally measured values of color. This guide is general in scope rather than specific as to instrument or material.