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  • Posted by Shane Ross on August 9, 2007 at 10:01 pm

    OK…when I go watch Quicktime Trailers on Apple, and I choose the HD options, I am presented with THREE choices: 1080P, 720P and…480P? Now, I have noticed this for a while but didn’t really stop to think about it. Where did this come from? 480 is a STANDARD DEF format…and not even the TRUE 720×486…but the DV 720×480 aspect ratio. So how on EARTH can they call 480P High Definition?


    Littlefrog Post

    Steve Mc replied 16 years, 9 months ago 10 Members · 13 Replies
  • 13 Replies
  • Chris Borjis

    August 9, 2007 at 10:29 pm

    well, progressive 480 being 480P I can understand, though I don’t know why apple would call that HD.

    JVC I can understand.

    The HDxx series cameras have a special HDV 480P mode that
    records SD in progressive.

  • Tony

    August 9, 2007 at 10:49 pm

    480P was once called Advanced Television.

    I demo’ed several times 480P footage I shot and many viewers mistook it for 1080 HD.

    I nicknamed 480P “poor man’s High Def”

    Damn best looking Standard def by far.

    Too bad it never caught on but that’s another story.

    Tony Salgado

  • Jeff Carpenter

    August 10, 2007 at 1:11 am

    Ok, here’s your answer! (That I just made up.)

    HD has less to do with pixels than display size. If you put DVCPRO up on an IMAX screen it wouldn’t look quite so “HD” anymore, would it?

    So you’ve got to look at this in a “pixels per inch” kind of way. Using some very hasty math I just determined that a 480p file on my 23″ screen (at a height of 5″) has roughly 3 times the pixel density than a HD picture on a 50″ 1280×1080 HDTV (at a height of about 30″).

    So that online trailer should appear to be 3 times as sharp as a network HD show! If “3 times as sharp as HD” doesn’t count as HD I don’t know what does.

    I dunno. Any good for a made-up answer?

  • Walter Biscardi

    August 10, 2007 at 1:47 am

    [Shane Ross] “So how on EARTH can they call 480P High Definition?”

    At NAB a guy who works for Nintendo came to me at the AJA Booth to ask how he would edit 480p HD material for the Wii. That’s their HD format. How 480p is called HD I don’t know, but that was the first time I ever heard of it.

    I guess it’s really a progressive SD 16:9 format that scales up nicely to 720p?

    Walter Biscardi, Jr.
    HD Editorial & Animation for Broadcast and independent productions.

    All Things Apple Podcast!

    Read my blog!

  • Shane Ross

    August 10, 2007 at 2:44 am

    Jeff, I’ll take that made up answer. Good one.


    Littlefrog Post

  • Uli Plank

    August 10, 2007 at 8:06 am

    Well, anything that has higher definition than SD can be called “HD”, I suppose.

    If this is 16:9 and progressive square pixels, you’ll have 854 pixels horizontal vs. 720 and full 480 px vs. 336 perceived vertical definition (Kell factor for interlaced) in SD.

    In CS it would even be 1128 px wide

  • Christian Glawe

    August 10, 2007 at 3:07 pm

    I seem to remember that, for awhile, FOX’s HD channel was broadcasting in 480p – I think they’re 720 now, though…

  • Chris Borjis

    August 10, 2007 at 7:59 pm

    [walter biscardi] “guess it’s really a progressive SD 16:9 format that scales up nicely to 720p?”


    Those that have shot/edited/scaled the JVC HDV 480P to 720 had the same impression.

  • Andrew Kimery

    August 10, 2007 at 11:59 pm

    I’ve always seen it fall in the “enhanced definition” catagory.


  • Graeme Nattress

    August 12, 2007 at 9:40 am

    Kell factor is how resolution is perceived (due to the integration effect of the sampling filter on the display), but Interlace filtering is the actualy reduction in vertical resolution to avoid interlace twitter. Usually interlace filtering will reduce resolution to about 70% or so of the rated total. Kell effect effects all displays, the percentage being based upon the type of display, but is also in the 70% or so region. – Film Effects and Standards Conversion for FCP

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