@pilou said:
For a poster > A0 no need to have more than 25 dpi !
It's made for see it to 3 meter or more
Formula resolution for human eye 76 DPI for 1 meter
So 5 meters = 15 DPI
You may be right, pilou, but skylabridges already explained he doesn't make a poster but a high quality art image.
I can imagine he has some very complex scene in which you do need to stand close to see fine details. For example, just imagine a big image of one part of New York City and you want that cars and people are recognizable enough. I would like to see his model - probably he was working on it like a slave.
I also doubdt he needs 300 dpi but probably he cannot go under 150 dpi, and maybe 200 dpi, which is also very, very fine. Indeed.
Dpi (dots per inch) is a printing term.
skylabridge, if you take JQL's advice about splitting your render into multiple regions, then first try to find out which photo editor can do the job.
High-end medium-format camera manufacturers have cameras which take photos of 60 Mp and even 80 Mp (Hasselblad H4D-60, H5D-60, PhaseOne IQ2 Digital backs etc...). It's still 5-10 less than what you need, but those cameras are used by professionals so why not to contact some of them. I'm sure they join their biiiig RAW photos in order to make some panoramic images so maybe they can give you a word of advice about possible photo editors.