CCIR YIQ Color System

The CCIR YIQ color system is defined as a standard for the broadcast industry by the "Commission Consultative Internationale des Radiocommunications" (recommendation 601). Similar to the YUV system.

Specifies one luminance and two chrominance components (Inphase and Quadrature). These parameters are related by a linear transform to the RGB coordinates.

The luminance carries the black and white information.
The I and Q chrominance carry the chromatic information. They are often down-sampled without loss of visual quality. They are dephased by 33° with respect to the YUV U and V components.