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Hitachi 32LD7200 - Aspect Ratios

Discussion in 'LCD & LED LCD TVs' started by mart9802, Jun 20, 2005.

  1. mart9802

    mart9802
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    Hi All,

    Based on all the good noises around this TV I bought one last week -
    have to say I'm very pleased - all sources present an excellent picture
    including Freeview.

    Only slight gripe I have is that I think the manual and aspect ratios
    provided are unusually cryptic - just wondered if anyone else out
    there had one of these yet (I know a few people on this board do)
    and had concluded anything?

    Questions:

    What the heck is the "Panoramic" setting supposed to do?

    Is "Full" really 16:9? If it is, why not name it that? ...and if it
    isn't then how to I get true 16:9? The reason I ask is that
    the (Clearly translated!) manual states you should use "Full"
    when you want to stretch a 4:3 (1.333:1) source to 16:9 -
    that's fine but all UK PAL DVDs are actually 1.25:1 (720x576)
    ...so is it really stretching enough?

    Answers on a postcard....

    Cheers,

    [Mart]
     
  2. dvdchild

    dvdchild
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    i also purchased this set and this aspect ratio malarky confused me. I think that full will give you 16:9 but don't hold me to that.
     
  3. matt_p

    matt_p
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    Panoramic = zooming of 4:3 to fill the screen, but with bias set to zooming of the edge of the picture, so the centre of the image remains in reasonably correct proportions.

    Full = full screen display, irrespective of the source. 16:9 will be correct, 4:3 will be stretched horizontally (with no Panoramic trickery).

    If you want correct proportions all round, set default zoom to 4:3. That way 4:3 will be shown as such (with black bars either side).
     
  4. mart9802

    mart9802
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    Thanks for the replies guys - it was actually 16:9 sources
    I am concerned about - I have a few movies with incorrect
    aspect ratios (1.25:1) - so I force it to "Full" - and they play with small
    black bars left and right and (I'm pretty sure) people look too tall & thin...could be something to do with my dvd player I suppose -
    just wondered if anyone else had seen any "skinny" people...

    I know Dave Berry has had some fairly technical explanations
    from a contact in hitachi just wondered if we could get the
    same inside "skinny" on this question....

    Cheers,

    Martin
     
  5. matt_p

    matt_p
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    Sorry, you've lost me. If you take a 4:3 image and stretch it to fill the screen, everyone should look short and fat, not tall and thin...

    720x576 is the resolution of DVD, 4:3 is the aspect ratio. They're not related to each other. Have you got your DVD player set to 16:9 widescreen?
     
  6. mart9802

    mart9802
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    Hmmm....well I won't claim to be expert in this area, but from what
    I have read....UK DVDs are 720x576 (That's 1.25 pixels horizontal
    for every 1 vertical), so when you put one in your DVD player the 16:9
    signal is sent to your TV and the horizontal is stretched to fill the screen -
    giving you the correct aspect ratio - all UK DVDs are the same resolution
    and the signal they send indicates to the TV to stretch a little to 1.333:1
    (for 4:3) or more for 16:9. Does that make sense?

    So what I'm saying is, if the TV starts with an assumpution of 1.333:1
    (4:3) and stretches a given set amount to make 16:9 then that's wrong
    because it should start with an assumption of 1.25:1...

    Now someones going to chip in and say TV pixels are not square, but
    I thought in LCD tv's they were...
     
  7. matt_p

    matt_p
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    No, for full frame stuff it's all 4:3.

    PAL resolution is 720x576, NTSC is 720x480. If you watch PAL and NTSC versions of a full frame move (the Shining, say) what you'll see on screen will be the same size and will both be 4:3 in proportion. The NTSC will just have fewer lines, that's all, leading to a slightly less detailed pic. You won't have the NTSC version being a different shape to the PAL version!
     
  8. matt_p

    matt_p
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  9. mart9802

    mart9802
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    Thanks Matt - as I mention above though, it's not 4:3 sources
    I have any problem with - I'm concerned the TV is not stretching
    a picture that should be 16:9 aspect ratio as wide as it should.

    Will expriment a bit more, but if no-one else it's probably
    just my set-up....

    Cheers,

    Martin
     
  10. dvdchild

    dvdchild
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    i do know what you mean about the picture. I was watching Die Hard Special Edition and it was on panoramic setting and it looked weird - everyone was slightly tall and thin. Set it to full and it looked normal. I would also be interested in the correct ratio setting for 16:9 viewing.

    DVDCHILD
     
  11. matt_p

    matt_p
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    I've finally got my head round what the problem is you're having. It's just anamorphic DVDs that are making your pic go a bit out of scale.

    Anamorphic DVDs make use of the full vertical resolution of DVD (essentially a 4:3 image) so that when it is squashed down on to your screen, it has more resolution than a 16:9+black bars scaled up.

    When you set the screen to Panoramic, the screen sees a 4:3 image (it doesn't know it's 16:9 scaled up vertically). It then takes this image and uses it's processing I described earlier to zoom it out to fill the screen, which will obviously make it look a circus 'hall of mirrors' job. You're basically trying to watch a 16:9 image in a mode designed for 4:3.

    Basically, for anything other than a 4:3 movie, set your TV to Full.

    I recommend taking the panoramic mode out in the function menu and setting default zoom to 4:3, that way everything will be in the correct aspect for everything you watch. I find the panoramic zooming modes on all widescreen TVs to be quite evil and rubbish.
     
  12. dvdchild

    dvdchild
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    i'll give that a try. Cheers MattyP

    :)
     

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