300dpi is usually acceptable resolution for a document - depending on how fine the print is. 200dpi is passable. SO a 31-inch doc should be around 6200 pixels wide. That’s a bit more than a 24Mp camera can produce. Then there’s the issue of focus, etc. That’s why I suggest at minimum stitching two halves with a better (24Mp) camera.
The other issue is flattening, based on the picture. At very least, a series of magnets along the edge, best is a sheet of glare-free glass (if glass and a polarized filter don’t work)
At a certain point, this gets to be too much work if there’s a scanning service nearby. Depends again what quality and resolution is acceptable.
I found out a local printing company scans large format documents, so I had them do it at 600 dpi. Did a nice job, and was only $18 for eight scans. Here it is. It is in one, large (88 MB) pdf file. Which is fine, but I would also like to save this as eight separate pdf files (one for each page). Does anyone know how to do this?
I don’t know how to split up PDF files, though I’m sure it’s possible and someone will post a solution, but I just wanted to say that $18 is a fair and reasonable price for that job.
You can use this tool to do it in your browser: Split PDF files online for free - PDFTool (edit: provided better link). It creates a zip file with the pages all split up.
It all happens on your computer (nothing gets sent to them), so it might take a while depending on your computer. It took mine about 4 seconds.
I see you found a solution. On my Mac, your file opens in the built-in ‘Preview’ app, and readily allows any individual page or set of pages to be ‘Saved As’ a new file. Took about 15 seconds…
