Blowing up an image to y X 24ft. (yes Feet)

Discussion in 'Beyond the Basics' started by FotoRave6, Aug 27, 2015.

  1. FotoRave6

    FotoRave6 TPF Noob!

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    I am looking to get a digital image printed onto fabric in the size y x 24ft. y= correct aspect ratio (in ft). What I do not want is the image to become pixelated so I want to maintain 300dpi or better. Is this possible and/ or what do I have to do to the image to maintain clarity?


     
  2. wyogirl

    wyogirl Oh crop! Supporting Member

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    well that greatly depends on what the original image pixel count is. and 200 dpi would be fine for that large.

    Actually, 24 feet? That's like billboard size.... so like 150dpi is standard since the viewer will be so far away. And its unlikely that you have the image quality to print anything at 24 feet and maintain 300 dpi with a regular camera. You would need medium or large format I am sure.

    Someone correct me if I'm way off base here.
     
  3. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    How far away will the viewers be?
     
  4. WayneF

    WayneF No longer a newbie, moving up!

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    24 feet is 288 inches. At 300 pixels per inch, that is 86400 pixels dimension. That is far from realistic. Your camera won't take that large. You might be able to create it by stitching a panorama of several images, if your software will handle an image that large (probably won't, Photoshop won't.) And then a JPG file won't hold that large, etc. Also fabric will not support 300 dpi, it is nothing like glossy paper.

    300 dpi is for image prints that we inspect holding under our nose (close, like ten inches). 24 foot images is a billboard, viewed from at least that many feet, usually done with a large view camera, but does not need anywhere near 300 dpi resolution.

    Sorry, all I know is negatives. I don't know how to do that job. I guess I would start at a billboard shop?
     
  5. jovince3000

    jovince3000 Fried potato lover

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    Funny because about a week ago I worked for a marketing compagnie which asked me to resize an image for a billboard, the ppi asked was 15ppi, just goes to show you can really cram down on print quality depending on the viewing distance and still make out a good picture.

    Btw :

    PPI : Pixel density - Wikipedia, the free encyclopedia
    DPI : Dots per inch - Wikipedia, the free encyclopedia
    BOTH ARE NOT THE SAME THING AT ALL

    All of it come down to what's the viewing distance and what is the purpose of the print.

    Here's a good read for you : Resolution for print viewing distance



    For your other question, when you are stretching an image (I will assume that with the size you want you will stretch the image) you want to sharpen it. Because the processing of stretching add pixels that were inexistent to the original image. Edges will be larger and thus blurry, the general image will appear smoother and details might be lost.
     
    Last edited: Aug 27, 2015
  6. Usul

    Usul No longer a newbie, moving up!

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    Maybe OP wants to make a wallpaper of his photo.
     
  7. jovince3000

    jovince3000 Fried potato lover

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    Since he mentioned fabric, I'd bet more on a tapestry of some sort.

    In any case @FotoRave6, what EXACTLY do you need it for ? We will be more able to help you if you add more details.
     
  8. 407370

    407370 No longer a newbie, moving up!

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    Everyone is assuming it is a photograph you want printed, is it?
    What is the subject matter? If it could be created by a 3D software it can be rendered pretty much to any size you want.
    A quick squint at some google answers seem to imply that resolution is not such a big issue as the billboard owners will supply templates for normal sized images that will then be scaled by the printing process. The aspect ratio seems to be more important element.
     
  9. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Probably. "digital image" usually means a digital photograph.
     
  10. unpopular

    unpopular Been spending a lot of time on here!

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    Your best bet is to speak with a large format printer. It is unlikely they will want to handle an image that big at 300ppi. At minimum, assuming that the smallest side is 24', you're looking at a 20GB file. Not impossibly unruly, but this size is going to push the memory limits of their RIP - the software that schedules and processes jobs in a way the printer can use.

    If you're going to "blow up" a conventional image from a high-resolution DSLR to that size using standard interpolation, you'll still get pixelation when viewed up close. Blurry, ugly pixelation. So there's really no practical reason for that kind of resolution if your starting file is less than 2x, maybe 3x what you're wanting to end up with.

    You will very likely be limited in materials at this size. The printer is going to have to feed and hold very large sheets of material without having it bunch up. My guess is, if your after a textile like linen or silk, this just won't be available to you.

    There are wall paper printing services. This is probably your best bet. I know nothing about what you'll actually end up with, so you'll need to discuss the finished product with your service provider.

    This isn't going to be cheap. One wall-paper provider charges at least 5.50/ft^2 at 500-999sq^2. At 24x24, this will be over $3000.
     
  11. KmH

    KmH Helping photographers learn to fish Supporting Member

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  12. unpopular

    unpopular Been spending a lot of time on here!

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    If your shortest side is smaller than 24', then it's going to be a lot easier for you. 8'x24' prints shouldn't be too much of a problem if you have the money, provided of course they can deal with your ppi requirement.
     

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