72 dpi to 300 dpi and printing sections to create very big image

Question

Hello,I'm helping an artist friend to try and understand how to organize files to print. It's slightly complicated, and part of the problem is we don't know how to describe it.He needs to transform a 72 dpi image to 300 dpi and create A3 files to assemble it at actual size, which is 290 x 226 cm. I've got to the point in photoshop where I've got it divided up, but I can't export them as single files, but I am really not sure.Does anyone have any suggestions, or resources they could point me to?Many, many thanks,Bronwyn

Test Screen Name · Accepted Answer

Well, this requirement is basically like wanting to convert chicken soup back to chicken. Printers will tell you that 72 ppi is not good enough to print, because there is no detail. Just increasing it to 300 ppi won't create the missing detail. This will cheat past the printer's checks, so they can print - print rubbish that is. Nobody will be happy, there will be much disagreement over who pays for the blunder. You (your friend) NEEDS to get quality originals, or change plans.

TheDigitalDog · Answer

There is zero difference in a document that is 1000x1000 pixels (as an example) at 72 dpi (PPI) or 720 dpi (PPI) or any such value. All are 1000x1000 pixels and the dpi/ppi is simply a metadata tag.

Now if you have a document that is 290x226 cm, how many pixels do you have and how many do you need?

This very, very old primer on resolution still seems necessary to post, this may help in understanding what the printer clearly doesn't by their request:

http://digitaldog.net/files/Resolution.pdf

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