Chrominance, often abbreviated as C, refers to the color portion of a video signal. It represents the hue and saturation information that defines how colors appear in an image, independent of brightness.
In video signal processing, chrominance is one of the two fundamental components that make up a video signal, the other being luminance (Y), which represents brightness or light intensity. Together, these two elements allow displays and monitors to reproduce a full-color image accurately by combining color and brightness data into a cohesive visual output.
Chrominance conveys color information by encoding two main attributes: hue (the actual color, such as red, green, or blue) and saturation (the intensity or purity of that color). In analog video systems like NTSC, PAL, and SECAM, chrominance is transmitted as a subcarrier signal combined with luminance. In digital video, chrominance is represented as part of the YCbCr or YUV color model, where “Cb” and “Cr” carry the blue and red color-difference signals relative to luminance. This separation allows for efficient compression and data transmission while preserving color fidelity.
For professional AV and broadcast environments, maintaining proper chrominance balance is essential for accurate color representation across multiple devices and transmission systems. Over-amplified chrominance can produce oversaturated or distorted images, while under-modulated signals can lead to faded or inaccurate colors. Consistent chrominance management ensures true-to-source color reproduction in applications such as broadcast production, digital signage, surveillance systems, and control room displays.
Chrominance standards and parameters are defined by the SMPTE (Society of Motion Picture and Television Engineers), ITU (International Telecommunication Union), and IEEE (Institute of Electrical and Electronics Engineers). These organizations establish color encoding methods, signal formats, and compatibility standards for video production and broadcasting.
The concept of chrominance originated during the development of color television in the 1950s, when engineers designed a system to broadcast color images compatible with existing black-and-white TVs. By separating color (chrominance) and brightness (luminance), early color TV systems could transmit both types of information over the same channel. This innovation became a foundation for modern color encoding systems, which continue to rely on chrominance and luminance separation in today’s digital video technologies.