0
votes
1answer
278 views

Gimp: how to remove background noise/artifacts and enhance handwritten text

I have a lots of scanned handwritten lecture notes (PDFormat) and I want to improve their readability (I have uploaded an example). In particular I'd like to remove the "squares" on the back. I would ...
0
votes
0answers
379 views

How to clean up scanned construction documents? [duplicate]

As a consultant to contractors, I receive PDFs of architectural drawings to use as backgrounds in CAD. Some are scanned copies, some are grey-scale and, if lucky, some are black and white. I use ...
7
votes
3answers
4k views

How to convert old scanned documents into black and white

I have some old documents that have been scanned, and I want to convert them to black and white. Content should be always black, and background white: I use Photoshop.