The YIQ color system is used by the NTSC color TV system. It was defined in the original 1953 color NTSC specification.
| ● | It is similar to the YUV color system. |
| ● | It specifies 1 luminance and 2 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, roughly corresponding to the orange-blue contrast and purple-green contrast respectively. They are often down-sampled without loss of visual quality. They are dephased by 33° with respect to the YUV U and V components. |