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DPChallenge Forums >> Tips, Tricks, and Q&A >> how to process mega-size prints
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09/27/2016 07:35:41 PM · #1
I've received a very exciting commission which may be printed as large as 8 feet on the long side, maybe even 10 feet.

Is there anything I need to do differently while processing the image (it will be a very complicated composite)? Do I just process the images in their native size and upsize later?

I'm almost through shooting all the elements, and I'd like to know before I get started with the processiong and have to do everything all over again :)
09/27/2016 07:44:03 PM · #2
Originally posted by tanguera:

Do I just process the images in their native size and upsize later?

That would be my first choice -- the fewer times you resample the images the better. If you can compose your source images so they will "work" in the composite without resizing it will be optimal.
09/28/2016 07:46:42 AM · #3
a lot will depend on the dpi of the printed image.

set your canvas to 10ft wide and the appropriate dpi and that should at least give you the minimum resolution you should start with if you don't want to upscale.

you can also take your the intended viewing distance into account if a high dpi results in a file size that is just yuuuuuuuge!
09/28/2016 08:44:10 AM · #4
maybe consider to print by Grieger in Dusseldorf, Germany.
They are specialized in ultra high quality/very large printings
youtube
//www.grieger-online.de/
09/28/2016 02:26:59 PM · #5
Originally posted by Mike:

a lot will depend on the dpi of the printed image.

set your canvas to 10ft wide and the appropriate dpi and that should at least give you the minimum resolution you should start with if you don't want to upscale.

you can also take your the intended viewing distance into account if a high dpi results in a file size that is just yuuuuuuuge!


It will be at the top of some stairs so it will be viewed both up close and from a distance. I'll have to deal with the YUUUUUUGE file size, LOL

But that's what I mean. Should I be working on the file from the beginning at that size? Or will there be a significant loss of quality if I start at the native file sizes and then upsize it at the very end?
09/28/2016 02:27:25 PM · #6
Originally posted by GeorgesBogaert:

maybe consider to print by Grieger in Dusseldorf, Germany.
They are specialized in ultra high quality/very large printings
youtube
//www.grieger-online.de/


I will look into this but the shipping fees for something this size might simply be prohibitive.
09/28/2016 02:39:26 PM · #7
Working on the full-size image will be a lot more memory-intensive, maintaining all the layers and such with bigger source images. Once you complete the composition you can save/export a composite image and upsize that (much smaller) image all at once.

I suggest making your master layout some evenly-scaled size (25%, 50%, etc.) of the final so that the upscaling can be easily computed (400%, 200%, etc.) and (presumably) be more accurate by avoiding calculations involving "fractional pixels" ...

Message edited by author 2016-09-28 14:41:06.
09/28/2016 03:16:13 PM · #8
Be aware that you most likely will need to "freshen up" your retouching after resizing as blemishes ,dust ,spots, fabric fuzz ,sensor smutz etc. that were not noticeable at original 200% suddenly become huge at 8feet .
09/28/2016 05:58:26 PM · #9
Originally posted by VisualDecay:

Be aware that you most likely will need to "freshen up" your retouching after resizing as blemishes ,dust ,spots, fabric fuzz ,sensor smutz etc. that were not noticeable at original 200% suddenly become huge at 8feet .


Excellent point. But imagine I'll do that to the final, flattened, and separately saved image.

Good point on the evenly-sized save, General
09/29/2016 07:41:02 AM · #10
Originally posted by tanguera:



It will be at the top of some stairs so it will be viewed both up close and from a distance. I'll have to deal with the YUUUUUUGE file size, LOL


what's scale of the concept? is it going to be a large print of image meant to be taken as a whole is it going to be a 8foot long extremely detailed "where's waldo"?

if its the former, i think you can live with some upscaling since the majority of viewers wont be eyeballing details with their noses on the print. if you need to maintain the smaller details for the latter then i would work with a higher resolution file and avoid upscaling if you can.

Message edited by author 2016-09-29 07:41:22.
09/29/2016 11:40:03 AM · #11
Originally posted by Mike:

Originally posted by tanguera:



It will be at the top of some stairs so it will be viewed both up close and from a distance. I'll have to deal with the YUUUUUUGE file size, LOL


what's scale of the concept? is it going to be a large print of image meant to be taken as a whole is it going to be a 8foot long extremely detailed "where's waldo"?

if its the former, i think you can live with some upscaling since the majority of viewers wont be eyeballing details with their noses on the print. if you need to maintain the smaller details for the latter then i would work with a higher resolution file and avoid upscaling if you can.


Somewhere in between - mostly large elements, but then a few smaller ones. Nothing too tiny though.
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