YIQ Color System

The YIQ color system is used by the NTSC color TV system. It was defined in the original 1953 color NTSC specification.

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It is similar to the YUV color system.

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It specifies 1 luminance and 2 chrominance components (Inphase and Quadrature). 这些参数通过对 RGB 坐标进行线性变换而相关。

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亮度携带黑白信息。

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The I and Q chrominance carry the chromatic information, roughly corresponding to the orange-blue contrast and purple-green contrast respectively. 它们经常被进行下采样而不损失视觉质量。相对于 YUV U 和 V 分量，它们被去相移 33°。