Colonel Panic wrote:I fear this project will be cancelled; asked whether sitting close to it will mean I can see pixels etc, their reply was "if the wallpaper is larger than 3 metres wide, you will see pixels / blur unless you are sitting a few metres away". Bummer
Whilst it's entirely possible to print a whole wall sized image without visible pixellation, the issue would be finding a suitable source image in the first place!
Let's say you could accept 150ppi - 'Not Great, Not Terrible™'
480cm x 180cm means you'd need 28350 x 10650 pixels. That's 302 megapixels (!) not gonna happen...
300ppi which would realistically be the minimum acceptable resolution... 1.2 gigapixels
One alternative is something vector based which would have infinite resolution.