Poster size photo database
Discussion
I'm trying to find a database of photos that I can buy a few images from and have them blown up to poster size (at least 85cm by 60cm odd but preferably a meter high) and put in a backlit box.
The only databases I can find have image resolutions that only allow a picture size of 50cm or 60cm high at 300dpi which I believe is the limit for unpixelated images.
Anyone have any links for BIG images databases? I've Googled and found things like image shack but not enough res.
ETA At A1 size would you have to go up to 300dpi or would 200dpi be ok?
The only databases I can find have image resolutions that only allow a picture size of 50cm or 60cm high at 300dpi which I believe is the limit for unpixelated images.
Anyone have any links for BIG images databases? I've Googled and found things like image shack but not enough res.
ETA At A1 size would you have to go up to 300dpi or would 200dpi be ok?
Edited by Driller on Wednesday 16th May 21:12
Driller said:
ETA At A1 size would you have to go up to 300dpi or would 200dpi be ok?
Whilst trying to keep it simple, the dpi is relevant depending upon the distance from which the image will be viewed. For example, what dpi do you think those huge roadside advertising billboards are?300 dpi at 85cm is 10000px.
The Nikon D800 SLR , highest pixel count SLR on the market, brand new, is 7360 x 4912 resolution.
You need to either back off on your resolution requirements or find someone specialised in Medium format shooting, or get someone to stitch multiple shots.
Frankly 300dpi for posters is hugely excessive.
The Nikon D800 SLR , highest pixel count SLR on the market, brand new, is 7360 x 4912 resolution.
You need to either back off on your resolution requirements or find someone specialised in Medium format shooting, or get someone to stitch multiple shots.
Frankly 300dpi for posters is hugely excessive.
As Rob says I think you will find that most large prints are viewed at a disatnace and 300dpi is somply not required, especially backlit.
Talk to whoever you plan to use for the printing and see what they say.
If you really need that level of detail the chances are that anyone with print facilities for the job will also have upscaling software to assist should it be required.
Talk to whoever you plan to use for the printing and see what they say.
If you really need that level of detail the chances are that anyone with print facilities for the job will also have upscaling software to assist should it be required.
A good way to think of this is to look at a ruler and consider whether you could actually see 300 individual dots in the space of one inch.
I think about 100dpi is the limit with the naked eye. OK so there are factors involved with printing to do with how the dots merge but it's a good starting point.
I think about 100dpi is the limit with the naked eye. OK so there are factors involved with printing to do with how the dots merge but it's a good starting point.
Thanks for all the information guys, this place amazes me yet again with its fountain of knowledge! (if that doesn't sound too trite).
Always makes me think of "How do you know so much about swallows Sir?"
I reckon these pics are going to be viewed at no closer than 1m and they'll be backlit (don't know if that makes a difference).
By what you're all saying, it sounds like between 100dpi (PPI?) and 200dpi should be fine then which means most of the pics on these image database sites will be ok.
Always makes me think of "How do you know so much about swallows Sir?"
I reckon these pics are going to be viewed at no closer than 1m and they'll be backlit (don't know if that makes a difference).
By what you're all saying, it sounds like between 100dpi (PPI?) and 200dpi should be fine then which means most of the pics on these image database sites will be ok.
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