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Anonymous
Hi, I'm thinking of printing out an A0 poster. Anyone have awesome hires pictures in that size (841mm x 1189mm or 2384 pixels x 3370 pixels)?
>> Anonymous
>>135907
Just what conversion did you use? There are some traps

For a start go here
http://en.wikipedia.org/wiki/Pixels_per_inch
(this anon leaves his house now, he will not answer for some time)
>> Climhazard !FVRiasq3c6
Ok, an A0 piece of paper is approximately 33.1 inches by 46.8 inches. Using the resolution you specified your printout would be about 72 dpi(dots per inch) your going to want at the very least 150 dpi if you don't want it to look like crap. So your going to want an image that is at least 4965 pixels x 7020 pixels.
>> Anonymous
As far as I know it depends on the printer's resolution how many pixel you want to get a full-res A0 printout. As put in this sentence (linked by Wiki):
"When printing it is important to make sure that the DPI is higher or equal to the PPI."

So, if you have a printer with 300 dpi (current A0 plotters can have 1200 dpi) you'd want at least the double of>>135909. For a plotter with 1200 dpi you'd need 39.732 x 56.173 and that's why you probably just should wait for a thread to post really /hr/-worthy material and try how big you can get it without looking crap. You can try this on any A4 printer if you know its dpi and edit the the image according to it.

On the other hand you could look out for some SVGs or wait for someone to publish his trace of an awesome pic. :)
>> Anonymous
Thanks for helping me out everyone.

First off, actually I don't know what dpi the printer I'm going to use is... university printers offer A0 size poster prints, so I figured "what the hell, I think I'll print out a poster." However, I don't know the dpi of the university printer... better get that checked out.

>>135909

Also, I used Adobe Photoshop CS to convert the measurements... yeah I barely use it. I'm a goddamn noob at this kind of thing.

Once again, thanks everyone, 4chan is awesome; I've learnt information about guns at /k/, pornstar names at /s/, anime at /a/, generally disgusting shit at /b/ and now dpi here at /hr/.

This place is a bloody goldmine.
>> Anonymous
in photoshop there's an option to change the dpi - you probably had it on 72dpi

change that number to 300 and see what you end up with

some large format printers actually print at a lower resolution/quality because they don't expect people to get too close to the poster
>> Linkitch
You all sound like fucking experts, how many of you have actually TRIED to print out a large image?
I've gotten images as small as 718x1024 pixels (72 dpi) printed out in 100x70cm (39.4x27.6 in) and it's not the best quality, but you can't really see that unless you get really close to the image. How many people sit within 1m of their posters?
As soon as you get more then 1m away from the poster you can't really see any edges or anything.
So my suggestion, go ahead and get it printed out.
>> Anonymous
>>135893

100 to 150 dpi is usually okay if you're going to slap it up on a wall and not walk to close to it. Any lower than that and you're usually going to get some pixelation that's going to be noticable from a distance. The posters I've done at work (I work for a printer) I usually do at around 150 dpi.

Most modern printers can do at least 300 dpi, some up to 1200 and 2400. Unless you're printing something that has to be commercial or production-level quality, those resolutions are usually overkill. Besides, the source needed for something like that would be fucking huge.

I made a quick png using the Fiber filter in Photoshop CS2 at A0 resolution and 300dpi as a "worst case" senario for a raster image. The result is a 260 MB image with a size of 9930 x 14040 pixels. Waaaaay overkill for a wall poster.
>> Anonymous
Once again thanks for the input.

But damn it, after reading this: http://www.rideau-info.com/photos/mythdpi.html, I don't know what to believe...

By the way, the pic I want to print out is 2384 pixels x 3370 pixels at 300dpi (I'm pretty sure). Picture of a crashed zeppelin (Lead Zeppelin?).
>> Anonymous
>>136666

>By the way, the pic I want to print out is 2384 pixels x 3370 pixels at 300dpi (I'm pretty sure).

At 300dpi, that image is only 7.947 x 11.233 inches large. Resizing that image to A0 size without resampling (i.e. resizing without having the program try to interpret new pixel information) makes the image 72dpi.

That's not ideal, but for a poster that's going to be used for personal use it should be fine.