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Old 7th July 2018
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Re: Printing very large!

When upsizing, the trick is to use interpolation to add pixels that wouldn't otherwise be there. Bi-cubic interpolation is the most common. This means that you'll be seeing apparently more DPI than a straight enlargement calculation might indicate. You obviously can't add detail that isn't there, but using interpolation will preserve apparent sharpness if you go looking closely.

Apps like Photoshop will do interpolative upsizing so you can do it before you send the image for printing. I'd hope that a decent print shop would do it for you though before they print if you hadn't done anything yourself.
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