I often have trouble estimating best image pixel size to large centimeter size, without causing much loss of quality.

Today is no different. A client wants a chosen image from shutterstock on his wall. (as wallpaper). The wall is 6680x1200mm

I can see on shutterstock the pixel size from the image. But how can I estimate if the pixel size is high enough for the size of the wall, without buying the image? Can I calculate what the minimum pixel format should be? If so, how can I do that?

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    @Danielillo That's actually the one I meant to link to, thanks! – Vincent Jul 25 '18 at 9:24
  • Hi Marlie, welcome to GD.SE and thanks for your question. Please have a look at the questions linked in the above comments, they are probably answering yours already. If not, feel free to edit your question by clicking the edit link. If you have any questions about this site or the Stack Exchange model, have a look at the tour and the help center. Keep contributing and have fun around here! – Vincent Jul 25 '18 at 9:26
  • I edited your question a little for legibility. We are a Q&A site, not a forum, and although we appreciate social niceties, those are usually reserved to comments (like this one) or Graphic Design Chat. If I happened to erase some essential information, feel free to edit the question again. – Vincent Jul 25 '18 at 9:31

The short answer:

Pixels / mm

In this case, if you have a normal photo, of 6000 px wide, which is fairly normal these days, from a 24Mpx camera, divided into your 6680 gives you a pixel size of a bit more of 1 mm. one pixel of one mm is pretty decent for a wall.

The long answer:

What resolution should a large format artwork for print be?

You can clearly see the pixel dimensions of the images in the images banks.

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