describes its progressive recording mode as follows: The operating instructions for the 60 Hz ("NTSC") Panasonic PV-GS500 camcorder describe its progressive recording mode as follows: The HDV Progressive Primer whitepaper mentions Progressive Segmented Frame mode: Consumer camcorders as well as most professional camcorders do not use PsF to record 24-frame/s video; instead they either record it natively in progressive form or apply 2:3 pulldown. 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 sometimes recorded in interlaced format, despite that the content is progressive. This may result in interlaced artifacts being noticeable on colored objects. Variants 24PsF (48sF, 1080sf24, 1920×1080/24/1:1SF) is the original PsF format, which is used in professional equipment for film-to-video transfer, for high definition mastering and for video exchange between networks. This may be the first universal video standard which transcends continental boundaries, an area previously reserved for film. 25PsF (1080sf25, 1920×1080/25/1:1SF) is used in 50 Hz systems for production that originates on video and is targeted for television distribution. 29.97PsF (1080sf29, 1920×1080/29.97/1:1SF) formats are sometimes used in 60 Hz systems for sitcoms and music shows. 29.97PsF as well as 30PsF (30p, 1080sf30, 1920×1080/30/1:1SF) formats are gaining popularity as an acquisition format for Web video delivery, because most video hosting web sites cannot stream video with rates higher than 30 frame/s. References Film and video technology