[RKDinOKC]

On the large format printer at work the lowest resolution you can get any kind of decent print is 100 dpi. My point and shoot 12x zoom pocket camera is 10 megapixel which produces an image that is 3648x2736 pixels, or a maximum of 36" x 27" print at 100dpi.

By contrast producing images for printing on a press or electronic press typically requires a minimum on 300dpi. At that resolution the biggest I can reliably print a decent image is 12x9.

I do have some pretty cool software that increases resolution about 170% fairly well.

Also some large format printers have a mode that they can make stuff really big for murals, some seem to work well, some do not.