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Participant
July 21, 2016
Question

Removing random dots or speckles in scanned documents using Adobe Acrobat DC

  • July 21, 2016
  • 2 replies
  • 49133 views

Paper documents scanned to .pdf often have random dots and speckles on the pages.  What tool in Adobe Acrobat DC do I use to remove or erase them?

[ Mod: Copied information from duplicate posting ]

Scanning paper docs. to .pdf often results in random dots and speckles appearing on the pages.  What tool in Acrobat DC do you use to remove or erase those random dots or speckles?

(I just downloaded DC.  I learning how to use it on the job.  The Adobe salesperson who sold me the produce on July 19, 2016 assured me that DC had such a built-in erasure or removal tool for the removal of random dots and speckles.  So, I want to know where that tool is located in DC.)

Carl Kirsch

[ Mod: Personal information removed ]

2 replies

VL Branko
Inspiring
June 3, 2019

I just scanned in a 340 page book using a Plustek Opticbook 3800 scanner using Win 10 on a virtual machine on my MBP. I used a different scanning software than I ususally use because the one I normally use (Book Pavilion) for some reason didn't save the scans to the disk. The new scanning software only allowed page by page tuning to eliminate speckling rather than be able to adjust the brightness/contrast for the whole job. At the end every page had thousands of tiny unsightly speckles. I was not happy.

But then I remembered Scan tailor. This free software is popular with  DIY bookscanners for processing images before turning them into PDFs.

The newest version doesn't work natively on Macs so I downloaded the latest PC version for my virtual Win 10 machine.

Scan Tailor only works on images, to get them I saved the PDF of the book as images (PNG) and then processed it using Scan tailor. One of the settings at the end is for de-speckling, I chose medium, pressed the button and then turned all the images back into a PDF. All speckles were gone. YMMV play with it and adjust settings to suit your needs.

AdUser0924
Participating Frequently
May 3, 2023

Affirmative, ScanTailor Advanced is the name in town. 

Karl Heinz  Kremer
Community Expert
Community Expert
July 21, 2016

On the scanner dialog, you can select to optimize your scanned images, but with newer versions of Acrobat, there is no longer a "despeckle" option (which was there until probably Acrobat 9). You can try to see if a combination of the available options will give you a despeckled image. I would try to use the despeckle option that comes with my scanner software. To use that, you would have to select the native scanner user interface vs. Acrobat's scanner interface.

Participant
July 21, 2016

Karl,

Here is what a chat agent suggested as a way of removing random dots and speckles from scanned documents:

Priyanka: I would like to inform you that there is no erase option is present (sic) under Acrobat pro dc
Priyanka: but yes you can do one thing

carl kirsch: I should be able to "edit" any speckle or random dot out of existence.
Priyanka: you can got (sic) to edit pdf and then select text box and then past (sic) it to those places where dots are present
Priyanka: then select the text box and change the color as white.
carl kirsch: Okay. That makes sense. So the suggest[ed] solution is to paste a text box over the random speckle or dot and then delete it just like I would do to text. Right?
Priyanka: there is no need to delete
Priyanka: you can change the color of the text area
Priyanka: text field boundry
Priyanka: boundary *
carl kirsch: What color would I change to? White?
Priyanka: yes

END

________________________

Karl, what the agent is suggesting is that I go to the "Edit" toolbox, select the "text box" tool and surround the random dot or speckle with a "text box" and, thereafter, change the color of the interior of the text box to the color "white", thereby in effect "erasing" the dot or speckle. 

To me, the agent's suggestion (that I have not tried out yet) is a simple and straightforward workaround to the absence of a specific eraser tool built into Adobe Acobat DC.  What do you think?

(By the way, Nuance's Paperport 14 has an eraser tool. After you scan a document using Paperport's scan function, you can save it to .pdf on Paperport's desktop.  Thereafter, you use Paperport's eraser tool to delete any random dots and speckles on the .pdf document.  After you clean up the .pdf document, in Paperport, you open the cleaned up .pdf doc. with Adobe Acrobat and save the cleaned up .pdf document using Acrobat to any folder on your computer.  Before I bought Adobe Acobat Standard DC ("DC"), I asked the Adobe salesman if DC had such an eraser tool and he said, "Yes; it's built into DC."  Sadly, I now learn no such eraser tool exists in Adobe Acobat Standard DC.  To me, that is a major design flaw in the current versions of DC Standard and Pro. I am very disappointed.  I would demand my money back and return to using Acrobat X, but Adobe no longer supports Acrobat X.  Hopefully, the chat agent's suggestion above will work, because my Paperport that has worked flawlessly for years has now developed an unresolved problem that is interfering with production of a cleaned up copy of a .pdf document scanned to Paperport.)

Carl Kirsch

Participant
July 21, 2016

Karl,

PS: Any "de-speckle" tool is clumsy and inefficient, because such tools do not recognize and eliminate all random dots or speckles; hence, the need for a target specific eraser tool.