IEC 61988-2-6:2015（E）定义了作为PDP模块（等离子体显示模块）APL函数的伽马和色域特性的测量方法。通常，PDP模块的亮度水平取决于输入图像的APL（平均图像水平）。改变输入电平会导致RGB原色的色度发生变化。本标准还定义了不同APL的色调特性和色度特性的测量方法。本标准基于逆伽马电路位于模块内部的假设。

IEC 61988-2-6:2015(E) defines the measuring methods for gamma and colour gamut characteristics as a function of the APL for a PDP module (plasma display module). Generally, the luminance level of a PDP module is dependent on the APL (average picture level) of input images. Varying the input levels causes a change of the chromaticity of RGB primary colours. This standard also defines the measuring methods of tone characteristics and chromaticity characteristics with varying APLs. This standard is based on the assumption that the inverse-gamma circuit is inside the module.