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400VC, grain, and resampling! - Photography

> What do you mean "naive" resize? That is not one of the Irfanview options. > Was this a downsample or upsample, by what factor, and with what software? > Why are you showing the results of resampling when discussing film grain? > (Perhaps you have a good reason, but you didn't state what it was.) > Well the first image looks exactly what I saw when viewing the 4000 DPI, 56mb TIF file. The dimensions were approximately 5400x3085. It was very grainy and ugly. This is the main point of my post. The default image looked horrible when scanned ...

  1. #1

    Default Re: 400VC, grain, and resampling!

    > What do you mean "naive" resize? That is not one of the Irfanview options.
    > Was this a downsample or upsample, by what factor, and with what software?
    > Why are you showing the results of resampling when discussing film grain?
    > (Perhaps you have a good reason, but you didn't state what it was.)
    >
    Well the first image looks exactly what I saw when viewing the 4000 DPI,
    56mb TIF file. The dimensions were approximately 5400x3085. It was very
    grainy and ugly. This is the main point of my post. The default image
    looked horrible when scanned at such high resolution.

    The image didn't look nice _unless_ I downsampled to 1024x585 _and_ used a
    slow resample filter.
    >
    > That one looks a lot better, in fact almost as good as your Velvia scan,
    > and 400UC is a film with 3 stops more speed! Until you tell us exactly
    > scaling factors were involved, it's hard to compare.
    >
    Well remember that I'm using 400VC-- *not* 400UC. By looking at your
    posting history, aren't you a critic of 400VC and a fan of the UC? If so,
    I don't blaim you for disliking the VC. As I tried to make evident, my
    scans were very grainy without applying resampling filters.

    Mike Marty Guest

  2. #2

    Default Re: 400VC, grain, and resampling!

    Mike Marty <mikemcs.nospamwisc.edu> wrote:
    >
    > Well the first image looks exactly what I saw when viewing the 4000 DPI,
    > 56mb TIF file. The dimensions were approximately 5400x3085. It was very
    > grainy and ugly. This is the main point of my post. The default image
    > looked horrible when scanned at such high resolution.
    >
    > The image didn't look nice _unless_ I downsampled to 1024x585 _and_ used a
    > slow resample filter.
    Thanks Mike. What confused me is that the two images looked to be
    the same size. So your downsample was 18.96%? Lanczos looked good.
    > Well remember that I'm using 400VC-- *not* 400UC. By looking at your
    > posting history, aren't you a critic of 400VC and a fan of the UC? If so,
    > I don't blaim you for disliking the VC. As I tried to make evident, my
    > scans were very grainy without applying resampling filters.
    My mistake: I read U for V. So we probably agree that Porta [sic] 400VC
    is a fairly horrible film for 35mm work. Sometimes I think it might be
    grainier than even Max 800. The official PGIs are both 48 but obviously
    Kodak Consumer division is lying because Supra 800 is PGI 50 and to my eye
    is less grainy than Max 800 GT-3.

    All I can figure is that 400VC is for medium-format fashion photographers
    who want to bring out colors of clothing while keeping skin tones neutral.
    Portra 400UC skin tones might be too warm for this type of work, although
    they're smoother due to finer grain. I find 400UC less grainy than 160NC
    when underexposed, and only slightly grainer when fully exposed.

    Bill Tuthill Guest

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