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Thread: Image up-sizing

  1. #1

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    Image up-sizing

    I've got numerous 22 MP (12.5 x 18.75) images that are stellar @ 200% magnification...
    I am also anal retentive about having prints capable of nose-length viewing distance.

    What is the best way to up-size that 22 MP image to something in the area of 24 x 36" and
    maintain that same print viewing distance?

  2. #2

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    Re: Image up-sizing

    If you're asking about algorithms, I have found that bicubic splines are as good as anything. I've tried Fourier interpolation, which is supposed to be better according to some, but I can't see any improvement -- and it's much more limited in up-res'ing options -- you need to go up in powers of two on the program that I used. Stay away from pixel replication and linear interpolation. And you really can't do more than double (in each direction. 4x, if you prefer) without noticeably degrading the image. FWIW

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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    I've got numerous 22 MP (12.5 x 18.75) images that are stellar @ 200% magnification
    Can you post a 100% crop, say 1500x1000px, from a stellar image in PNG format that was never a JPEG?

    200% on your monitor as in zooming in? If so, how does your viewer upsize the image - e.g. nearest neighbor, "smooth", etc.?

    ...
    I am also anal retentive about having prints capable of nose-length viewing distance.

    What is the best way to up-size that 22 MP image to something in the area of 24 x 36" and
    maintain that same print viewing distance?
    I rarely upsize images, but Lanczos2 should give the best acutance for what you seek.

    FastStone Viewer offers a very good selection of re-sampling algorithms including Lanczos2 and Lanczos3.

    Also see methods compared:

    https://clouard.users.greyc.fr/Panth.../index-en.html

    http://www.harrisgeospatial.com/Comp...os-kernel.aspx

    http://gis.stackexchange.com/questio...patial-context

    "bicubic sharper" might be good enough for you, too.

    After up-sampling, increasing detail contrast might help. Or wider radius un-sharp mask, or de-convolution sharpening.
    Last edited by xpatUSA; 3rd August 2016 at 04:21 PM.

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    Re: Image up-sizing

    200% via PS CC

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    Administrator Manfred M's Avatar
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    Re: Image up-sizing

    Any upsampling is going to introduce some softness into the image. After you upsample, sharpen the image at 100% size.

    I use Photoshop for 100% of my upsampling, and while the algorithms in some of the older versions were not great, Adobe fixed that issue years ago and I see no difference (when pixel peeping) with what Photoshop CC does versus what OnOne Resize does.

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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    200% via PS CC
    I don't use PS CC so that means nothing to me, sorry.

    Any chance of a link to a 'stellar image' at 100% or posting a crop here?

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    Administrator Manfred M's Avatar
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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    200% via PS CC
    200% is not that much of a "heavy lift" for an enlargement.

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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    I've got numerous 22 MP (12.5 x 18.75) images that are stellar @ 200% magnification...
    I am also anal retentive about having prints capable of nose-length viewing distance.

    What is the best way to up-size that 22 MP image to something in the area of 24 x 36" and maintain that same print viewing distance?
    Printing your 12.5 x 18.75" 300ppi 22MP image at 150ppi would do it. Pixels would be visible by the average human at your viewing distance in either case . . .

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    Re: Image up-sizing

    This is part of a photo-merge of a GBH that I made a while ago...took the best parts of several images.
    Sharpened in LR only.

    Image up-sizing

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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    This is part of a photo-merge of a GBH that I made a while ago...took the best parts of several images.
    Sharpened in LR only.

    Image up-sizing
    Sorry, William, neither Elements nor FastStone can open the image on my Win 7 Dell.

  11. #11

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    Re: Image up-sizing

    neither Elements nor FastStone can open the image on my Win 7 Dell.
    I can't explain that, have uploaded all my images from Photobucket. Ever had trouble before?

  12. #12
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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    I can't explain that, have uploaded all my images from Photobucket. Ever had trouble before?
    Me neither; I use the right-click, save image as, in FireFox. Have had no trouble until today with that.

    Shopping calls, I'll try again later - more than one way to skin a cat, eh?

  13. #13
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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    I can't explain that, have uploaded all my images from Photobucket. Ever had trouble before?
    The file is definitely corrupted. Windows Viewer won't open it. Nothing else will either :C

    The GIMP says "Not a JPEG file: starts with 0x3c 0x21" whatever that means . . .

    JPEGsnoop says

    "JPEGsnoop 1.7.5 by Calvin Hass
    http://www.impulseadventure.com/photo/
    -------------------------------------

    Filename: [C:\Users\Ted\Desktop\basic-GBH-Rising-800-pxle-crop.jpg]
    Filesize: [182020] Bytes

    Start Offset: 0x00000000
    NOTE: File did not start with JPEG marker."
    Last edited by xpatUSA; 4th August 2016 at 12:44 AM.

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    Re: Image up-sizing

    William,

    Are you printing or a third party? If a third party, do you have freedom to apply specific algorithms or formats?

  15. #15

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    Re: Image up-sizing

    It's possible that I uploaded to photobucket without using jpeg.
    apply specific algorithms or formats?
    don't have a clue.

  16. #16

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    Re: Image up-sizing

    Pops right up and saves to my Win 10 machine fine. Even the one in your last post...

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    Re: Image up-sizing

    And mine, seems to be a standard .jpg

  18. #18
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    Re: Image up-sizing

    Quote Originally Posted by Stagecoach View Post
    And mine, seems to be a standard .jpg
    And now mine . . for some completely unknown reason.

    Ho hum.

  19. #19
    Administrator Manfred M's Avatar
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    Re: Image up-sizing

    Quote Originally Posted by xpatUSA View Post
    And now mine . . for some completely unknown reason.

    Ho hum.
    Technology is a wonderful thing. When it works...

  20. #20
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    Re: Image up-sizing

    Quote Originally Posted by chauncey View Post
    It's possible that I uploaded to photobucket without using jpeg.

    don't have a clue.
    Have you tried upsizing from the RAW image? I've been playing with it and it helps if noise reduction is done in-camera or only needs to be applied moderately.

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