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mastodon88
Joined: 24 Oct 2013
Posts: 3
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 Posted: Thu Oct 24, 2013 3:10 am Post subject: Resolution for Large Print |
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Hi All,
Bit of a newbie question here.
I have a photo that I want to blow up for print.
Finished size to be, 6 metres wide x relative h
The image I was supplied @ is 100 DPI. @ 300 mm wide in photoshop
How do I blow this up so that you have an 'good enough' resolution for print.
Not too sure of the process, but @ 100 DPI, if I wanted to extend the picture of 300mm wide to a new size of , 600mm wide. I can just increase the DPI to 200
Thoughts? |
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Auieos
Joined: 29 Jan 2010
Posts: 2019
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| Posted: Thu Oct 24, 2013 5:13 am Post subject: |
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6 meters wide is actually 6000mm. If you are going from 300mm to 6 meters you will have a bit of work a head of you.
You can increase DPI in Photoshop however its not going to work the way you want as the quality was never there to begin with.
If your serious you will need a third party image enhancement program for this. Photoshop just doesn't have what it takes for these types of enlargements.
I have PhotozoomPro and it has worked for me but there are plenty of options so I recommend you do your research before you commit to one.
A lot will depend on what you are trying to print too. If it is fairly plain the you are in luck. If it is something like a landscape with a lot of small details then get ready to really work for it.
There are some tricks you can try after blowing it up to 6 meters like using special filters that simplify the image and clean it up at the same time. Topaz and Alienskin come to mind.
I personally have managed to get a printed 2.2m canvas out of a 200mm jpeg but it was black and white line art so the type of image made for that sort of feat.
Anyway let us know if you are aiming for 6 meters or just 0.6 of a meter. |
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mastodon88
Joined: 24 Oct 2013
Posts: 3
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| Posted: Thu Oct 24, 2013 5:41 am Post subject: |
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Thanks for the reply,
It will be printed on adhesive mounted to wall graphic. It's just a backdrop. Nothing fancy and people will never really look up close so quality can be dull.
I think it is just a matter of maths and process.
I take it 300mm wide set at 100 DPI
If I need to resize it to 600mm wide
Do I just up the res to , 200 DPI. ?
So if it needs to be 6000mm wide. (6 metres)
Can this be done at 2000 DPI (although im aware that it'll take awhile to interpolate as it'll pass over a Gig)
But I'm happy to res it down to 1200 DPI and save as a photoshop eps and link it in Illustrator for print.
Hope this makes sense LOL! |
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mastodon88
Joined: 24 Oct 2013
Posts: 3
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| Posted: Thu Oct 24, 2013 5:51 am Post subject: |
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I just re-read my reply and I've confused myself LOL
I have another example.
I was given a photo, dimension was 411.5mm wide @ Resolution of 240 DPI.
The client wanted to print on canvas that was going to be 2400 mm wide
Some cropping will occur.
How would you do this in photoshop? |
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Auieos
Joined: 29 Jan 2010
Posts: 2019
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| Posted: Sun Oct 27, 2013 3:51 am Post subject: |
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ok it's a bit clearer now, sorry for late reply have been busy past few days.
A 200DPI, 300mm image is exactly the same resolution as a 100DPI, 600mm image.
So yes, your 6 meter wide image at 100DPI would be a 2000DPI at 300mm wide.
This here is a great article which you should read also:
http://www.htmlgoodies.com/tutorials/web_graphics/the-resolutions-too-low-printing-web-graphics.html
Generally print standard is 300DPI however once you get up to things that are 2 meters plus in size the DPI can dropped due to viewing distances being farther back with these.
Preference of DPI for large format prints varies however at 2-6 meters I would recommend a maximum of 150DPI and a minimum of 100DPI.
Now on to your final reply: Your photo, 411.5mm wide @ Resolution of 240 DPI.
To print to canvas you want 2400mm @ 150DPI. So if you go into Photoshop and edit the image size to 2400mm @ 150DPI it will turn out bad.
This is very important. If you up the image size/DPI in Photoshop it can only work with what you gave it in the first place.
If you give Photoshop a 1 inch square image @ 100DPI and increase it to 100 square inches @ 100DPI. Photoshop has to make 1 million dots of image resolution out of the original 100 dots you gave it.
As I said in my first post, if your serious you will need a third party image enhancement program for this.
You may be able to get away with 'nothing fancy backdrops' if your inking it in illustrator and working on basic shapes but with photos you will kill yourself trying.
I hope haven't confused you too much. The article above is probably much clearer than I am.  |
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rocklikestone
Joined: 07 Nov 2013
Posts: 4
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| Posted: Thu Nov 07, 2013 2:20 am Post subject: |
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It would depend on distance that the people are viewing the image from - if it it's 1 to 2 metres away you could probably push it down to 72 dpi (most professionals wouldn't print a photographic image this large at 300dpi). But you're many pixels short of that even - and you can't just invent new pixels (maybe a lower resolution would work but you'd have to test it).
I would try getting larger resolution photos but if these are the images you have to use you might be able to get away with it. I would try scaling them to full size than print on some small pages without scaling them down as a test to see how it looks. But you'll never have something that looks crisp up close but you might need something that clear - considering you need to be a few metres away to see the image in it entirety. |
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rocklikestone
Joined: 07 Nov 2013
Posts: 4
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| Posted: Thu Nov 07, 2013 4:07 am Post subject: |
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you can increase your Resolution of any picture with the help of illustrator software ...with this picture pixel can also be manage...... |
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