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YCbCr709, often abbreviated as YCbCr709 or sometimes referred to by its full name, is a color space used in digital video and television broadcasting. It is based on the YCbCr color model, which separates color information into luminance (Y) and chrominance (Cb and Cr) components. This separation allows for more efficient compression and transmission of video signals, as the human eye is more sensitive to luminance than to chrominance.

The '709' in YCbCr709 refers to the ITU-R BT.709 standard, also known as Rec. 709. This standard defines the parameters for high-definition television (HDTV). Specifically, YCbCr709 specifies the primary colors, white point, and transfer functions used to represent the colors within the HDTV system. It was designed to be a common standard for HDTV production and transmission across various regions.

YCbCr709 is widely adopted in professional video production, digital cinema, and modern television broadcasting. It provides a consistent and accurate way to represent colors for high-definition content, ensuring that the image quality is preserved from capture to display. While other color spaces exist, YCbCr709 remains a fundamental standard for high-definition video.