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large prints
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Does somebody know what is the minimum resolution for prints of 2.5×1.5m and who can do that large format.
I have good experience with Photobox in UK but they can do only 30x20inch.You might be interested in the Digital blow ups article on the Canon Professional Services website. Photographer Paul Close shot a campaign for the NSPCC using a 10D in JPEG mode and his images ended up as large as 7m x 2m!
We’ve designed a number of exhibition stands and billboard posters over the years. We’ve always worked on the basis that the large format printers need files that are 1/3 of final size and this file to be 300dpi. I always apply a bit of unsharp mask too, just to bump it a bit.
This seems to be confirmed by Thorsten’s link.
Sorry, I see that the article states 1/4 size, though it never hurts to have the extra resolution. The trick is to work backwards, the people outputting the poster will usually tell you the resolution needed.
Interesting article…
I always find the discussion on large prints very interesting. The thing is, as far as I am concerned, the bigger the print is going to be, similarly the further away the viewer is also going to be. Take a look at all the advertising billboards you see around town. From a distance, they all seem sharp and high quality but as you get closer you see the obvious lack in detail. For me, the question isn’t always about final image size, it’s about where and how it’s going to be viewed. Are people going to be walking right up to the print, putting their noses right against to it and examining it for every single bit of detail or are they going to be standing off and admiring from the distance? The answer to this question very heavily dictates on how big and how well the image can be printed.
I’m a regular visitor to the Dublin Photographic Gallery in Meeting House Square in Dublin. More and more, the exhibits are from photographers shooting 35mm digital and the prints are always A0 and above (83.0 x 115.4 cm).
Apologies if this is taking the thread off on a tangent
Fully agree with you Ciaran. A 7×5/10×8 blow up needs a lot of sharpness because it’s only inches from your eyes. The bigger a print goes then the further away you are so you don’t see the loss of detail. I vaguely remember reading something about this a while back where the writer was saying that we like to keep a certain size in front of our eye to full view a picture, in other works lets say a 12×16 held at arms length covers a certain field of view, then a larger picture is kept in this same field so that the effective size is kept at 12×16 no matter how far away it is.
Don’t quote on the exact measurements but you get the gist.
The correct viewing distance is generally accepted to be the same as the diagonal length of a print. This is what the size of the circle of confusion (CoC) is based on and the CoC in turn is used in the calculation of depth of field.
Anybody examining a large print or a billboard close up is most likely a film biggot looking to pick holes in digital imaging and trying to argue the point that film has a higher resolution than digital!
Thorsten wrote:
The correct viewing distance is generally accepted to be the same as the diagonal length of a print. This is what the size of the circle of confusion (CoC) is based on and the CoC in turn is used in the calculation of depth of field.
The things you know :shock:
Roberto wrote:
Thanks Thorsten.
Very interesting article.Agree. Not only is this article interesting but surfing the other articles in the site.
Bookmarked, thank you ThorstenYou know what I like about this site? The posters are not only humourous, but clever and informed as well. Thanks Thorsten, do you know how difficult it is to google something you have no idea what the title is?
Now let me see… c i r c l e o f c o n f u s i o n (enter)
digitalbeginner wrote:
You know what I like about this site? The posters are not only humourous, but clever and informed as well. Thanks Thorsten, do you know how difficult it is to google something you have no idea what the title is?
Now let me see… c i r c l e o f c o n f u s i o n (enter)
Methinks you sound confused :lol: :lol:
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