Adventures of Robin Hood image dither?

Discussion in 'DVD Video' started by anthony, Oct 4, 2003.

  1. anthony

    anthony Guest

    Has anyone noticed in some scenes of the new Warner edition that there
    is what appears to be a very fine film grain which in fact is some
    sort of slight 'dither' effect.
    Whatever the cause (intentional?), the result is excellent.
    This very slight 'dither' has the effect on my 100-hertz Loewe Profil
    TV of eliminating the effect I see on some very good rock-solid
    transfers, of the viewer being able to see the resolution lines on the
    screen.
    The 'dither' interferes with that, and fools us (well, me anyway) into
    seeing a virtual high-res image on my conventional cathode-ray screen.
    anthony, Oct 4, 2003
    #1
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  2. On 3 Oct 2003 17:58:08 -0700, (anthony) wrote:

    >Has anyone noticed in some scenes of the new Warner edition that there
    >is what appears to be a very fine film grain which in fact is some
    >sort of slight 'dither' effect.
    >Whatever the cause (intentional?), the result is excellent.
    >This very slight 'dither' has the effect on my 100-hertz Loewe Profil
    >TV of eliminating the effect I see on some very good rock-solid
    >transfers, of the viewer being able to see the resolution lines on the
    >screen.

    This dither is an effect than has been done for several years to avoid
    jaggies and a "flitter" effect on sligthly moviing horizontal lines
    (such as variations in film registration. If a film image is simply
    scanned, the information on the film between the lines is missed, a
    tiny pattern on the film might pop in and out of scan, thus flickering
    in and out, causing the Sparkle or "flitterr" effect.. Widening the
    scan lines to not have gaps decreases the overall focus and maximum
    reslution, also there is some flitter still as the outside of the line
    is less bright or sensitive. To bias or dither or wobble the scan dot
    eliminates all of these, the whole film is covered, there's no
    flitter, and the maximum focus is maintained.

    >The 'dither' interferes with that, and fools us (well, me anyway) into
    >seeing a virtual high-res image on my conventional cathode-ray screen.


    The point beimg that you're seeing some detail above and below the
    scan lines that were buried in the dark before.

    Steve .
    Steve(JazzHunter), Oct 4, 2003
    #2
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  3. anthony

    anthony Guest

    Thanks Steve
    I guess some transfer specialists manage it better than others -- this
    example is just brilliant.
    anthony, Oct 4, 2003
    #3
  4. anthony

    Gary Quinton Guest

    On 4 Oct 2003 00:18:19 -0700, (anthony) wrote:

    >I guess some transfer specialists manage it better than others -- this
    >example is just brilliant.


    Are we talking about the same 'line resolution' I see on Nicole
    Kidman's white face in Moulin Rouge when she is on the swing?


    GaryQ
    Gary Quinton, Oct 5, 2003
    #4
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