Encoding of Color Information
Most video formats including professional ones utilize chroma subsampling to reduce amount of chroma information in a video, taking advantage of the human visual system's lower acuity for color differences than for luminance. Such a reduction improves compression of the video signal, which is always desirable because of storage and transmission limitations.
To ensure compatibility with interlaced-based systems, chroma information in PsF video is often recorded in interlaced format, despite that the content is progressive. This may result in interlaced artifacts being noticeable on colored objects.
Read more about this topic: Progressive Segmented Frame
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