i have a future project that involves printing a huge image that i will generate and have printed onto wallpaper to be installed on a wall to be a big wall sized mural. things i would like to know about this include the printing resolution. i have been searching for general wallpaper info and have quite a number of different widths and lengths of wallpaper rolls. i want to be sure i have correct edge markings on each roll to be sure it is easy to line up the image on the wall correctly. does anyone here on LQ know anything about computer generated wallpaper images, or good resources to find out what to do? i am only generating the image. i am not installing any wallpaper. both American and European standards would be good to have info on.

See how you go with https://www.wallsauce.com

You should look around your local area soon to find a printing service which can handle the job. (Ask local printers to recommend one, if they can't do it themselves.) Then, describe your proposed project to them in detail and ask them what their requirements will be. Print shops have a lot of amazing software at their disposal these days, and a variety of possible printing processes that might be used.

You might also find an advertising agency which can help you with the entire thing, including installation. They would be the "primary contractor" on the project, and they would subcontract various parts of it as they see fit. This is what they do for a living – take full advantage of their experience and expertise.

Depends on viewing distance.

Can't really get too high if you want up-your-nose views

But normal procedure would be printing A4 sheets with different resolutions, stick them on a wall and inspect/compare for acceptable compromise...

A guess would be up to 180 dpi, but files quickly grows... then break image up in sections.

Any local printer should be able to print endless rolls, but always talk to them before making final files.

For what it's worth – more than a decade ago, now, I actually was involved in a project for a regional museum where we took careful large-format photographs of an installation (that was about to be torn down) and then used them to create large printed re-creations for a permanent exhibit that is still there. We engaged an advertising agency which had relevant installation experience and were extremely satisfied. Along the way, there were many issues which they advised us of, which we could not have anticipated. The project went off without a hitch, because they knew what they were doing and we didn't pretend to.

"Everybody is an expert in something ..." and it pays to find the experts that you need. ("I can help you create any computer program that you want, but I don't fix my own car.")

A local printer company offers ultra large format printing.

I did see a deal on This Old House where some company did print on rolls of blank wallpaper for one of a kind paper.

The billboard paper we used to get in bundles of rags. It was a series of dots that made no sense till you backed away.