I'm thinking of putting a large wall paper with an astronomical motive on a wall. I found quite a number of wall papers by various vendors, but most of them are obviously computer generated images, which is a no-go.
Buyer beware. Huge printers are expensive, few places have them; you don't want wallpaper that's too skinny or paper that's not actually "wallpaper".
If you check that artists work he photographs a lot of vegetables too.
Can anyone identify the object?
Getty Images identifies it as: "Space galaxy - Blue and purple space galaxy", by 'sololos', Creative #: 91633822. That is most likely the original source. It's also available in a smaller size from the same person at iStock and is called: "Constellations. Cepheus (Cep) - Stock image". The image is purchased by various places to use unrestricted, for example the Irish Times wrote an article and used the image.
The "Large" size (assuming that's the size used by the place you plan on purchasing a copy from, to produce their enlarged version) is 4327 x 3245 px (36.64 x 27.47 cm) 300 dpi | 14.0 MP - a 14MP image blown up to 236 x 370 cm will be quite grainy close up. Every pixel will be a 10x10 block, if that was printed at 300 DPI (don't count on it) then 10 pixels would be 1/30th of an inch (~ 1mm). It's more likely to be 1/4 of that resolution, or 4x4 mm blocks.
The Wikipedia webpage for Cepheus and the Hubble Telescope image for Cepheus cause me to wonder if the image is correctly titled.
Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration and A. Evans (UVA, Charlottesville/NRAO/SBU)
A 7.2 megabyte 3600x2749 (9.9MP) .TIF file of the constellation Cepheus is also available from the Chandra X-ray Observatory. By starting with a known source, and using a high quality format, you can find somewhere that makes huge prints, and end up with something that won't devalue your property.
As an example, one place, wants $400 to create wallpaper. Shop around and check reviews if you only pay a couple of hundred bucks you'll probably be wasting a couple of hundred bucks; it depends upon what you want it to look like and most importantly how close you intend to view it.