need advice on getting photos printed large/canvas

Discussion in 'Australia Photography' started by Troy Piggins, May 2, 2008.

  1. Troy Piggins

    Ali Guest

    I like it.

    Of course you can post process it hundreds of ways to enhance it, but it is
    quite possible that they like it as it is, because of the memory.

    As for the size, it depends on how far the viewer is going to be looking at
    it from. The further back, the more you will get away with.
    Ali, May 2, 2008
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  2. Troy Piggins

    Troy Piggins Guest

    Yeah, shame about the clouds. Thanks for the feedback.
    Troy Piggins, May 2, 2008
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  3. Troy Piggins

    Troy Piggins Guest

    Thanks for the comments.
    Troy Piggins, May 2, 2008
  4. That's for 4x6 (where you get up close to see every detail)
    and other formats where you want to get *really* close up.

    Posters usually work out well at 150dpi --- many printers
    (posters are printed, not exposed (e.g. by a laser) and
    chemically developed) can't do more.[1]

    Canvas has a surface structure. That structure also limits how
    close you can come to the canvas and expect additional details.
    3000 pixels at 1 metre work out to 3 pixel/mm, or ~76 dpi.
    A 20/20 vision resolves reliably 1 arc minute (of black-white
    contrast), or 3 pixel/mm from 1 metre distance.

    For something to look pixelated, you need to be able to:
    - see individual pixels as an area
    - see a border where a change happens between individual
    Neither is given at 1 metre and 20/20 vision.

    At 20-30cm you might see pixelation if the printer uses a nearest
    neighbour interpolation (which I'd consider incompetent) and you
    have hard contrasts between pixels; with smoother interpolations
    (say, bicubic) you may notice some hard contrasts looking slightly
    blurry, but shouldn't notice pixelation.

    If you get much closer, the structure of the canvas will take over,
    limiting resolution and giving the eye 'grip' even on otherwise
    featureless areas, giving a stronger impression of sharpness
    (you can also see that phenomenon with (artificial) film grain).

    So, no, I'd not be overly concerned.
    If you need to, ask the printer for the exact pixel size he'll use,
    then upscale on your own and check on 100% view.

    I'd assume the printer knew his tools and thus did the upscaling
    and sharpening exactly as needed to get the best out of *his*
    medium, while I'd not know.


    [1] Printers may deliver very high dpi.
    But even the most expensive ones only have a handful of colour
    shades (e.g. black, photo-black, gray, light-gray, cyan,
    light-cyan, magenta, light-magenta, yellow). So they have to
    dither to get all the shades a photo has. Thus even 16x16
    (==256) dpi may give just 1x1 ppi ...
    Wolfgang Weisselberg, May 4, 2008
  5. Troy Piggins

    Troy Piggins Guest

    Thanks for the very detailed explanation Wolfgang. I'll file all
    that for future reference :)
    Troy Piggins, May 5, 2008
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