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Monika26085613rbxb
Participating Frequently
September 13, 2022
Question

small grey boxes when printing PDF

  • September 13, 2022
  • 3 replies
  • 12673 views

Hi,

I've had this issue for some time now, and it's starting to really annoy me. I've tried so many things I've found online, and nothing works. When I print a scanned PDF (whether or not it's sent by someone else or I scan it myself (different scanners)), I get random little grey boxes around the page. I just tested it myself - I got a blank sheet of paper and wrote something on it, then scanned and printed it, and it's a great example. It's not always this bad, but bad enough to be frustrating. Any help will be much appreciated!

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3 replies

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Michael28323483jy14
New Participant
February 8, 2023

I had a similar problem that I solved, at least for now. 

 

Whenever I scanned a small document to a PDF and them printed it out I would get the a grey background with a strange pattern on it as per attached. The yellow areas are post-it's covering personal info. 

 

When I opened the PDF in google chrome by right clicking on the document and select "Open with" and then "Chrome" it printed without the annoying images. 

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Monika26085613rbxbAuthor
Participating Frequently
February 9, 2023

Thank you for taking the time to share that. I don't get the pattern in the background, but on the actual scanned document itself. I did try your method, and it did print differently. It was slightly better - instead of the squares, it had small dots, which is an improvement. Since the original post, I changed printers (same brand, similar model) and I still get the same problem, so it must be software related.

Dave__M
Dave__M
Participating Frequently
September 13, 2022

Yeah, my guess is that those are scanned PDFs, and those artifacts are the result of scanning not just the text, but the paper itself.  If you have the option to scan in Black & White instead of grayscale, give that a try to see if gives a better result.  Another thing to try (can be labor intensive) is to see if you can select those gray boxes in edit mode to see if they can be deleted.

Good luck.

Dave

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Monika26085613rbxbAuthor
Participating Frequently
September 13, 2022

Unfortunately, deleting the boxes isn't an option, because they come up behind text as well. Also, I need to scan in colour (a requirement from clients). However, I don't print in colour.

Luke Jennings3
Luke Jennings3
Inspiring
September 14, 2022

I believe the boxes are caused by your printer converting an rgb dot into black, which is probably darker than 1%. Try converting a copy of your pdf to BW using a preflight profile shown in my screen shot, this should reduce or eliminate the boxes. Tools> Print Production> Preflight> Fixups (blue wrench icon).

Luke Jennings3
Luke Jennings3
Inspiring
September 13, 2022

So the boxes only show up when printed? can you upload a sample pdf? I suspect there are some 1% image areas (AKA scum dot) in the pdf and your printer is showing them a bit darker. Do you have an option to print as BW (not gray)?

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Monika26085613rbxbAuthor
Participating Frequently
September 13, 2022

I have a black and white printer, and cannot see a "grey" option anywhere in the settings. I've attached an example source PDF. Thank you.

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