Skip to main content
H
Hoka Hey
Inspiring
May 2, 2017
Answered

Add Background does not work for scanned documents

  • May 2, 2017
  • 2 replies
  • 5028 views

I'm using Adobe Acrobat Pro DC 2017. When I try to add a background to a page that I have scanned in, the document remains white.

However, I can change the background on pages that I've created digitally with Word.

If I try and change an entire file with some documents created by Word mixed with others that have been scanned, the results are the same. The scanned documents remain white while the digitally created documents change to the selected background color.

Oddly, an email that I "printed" to PDF ended up framed with a border that was the color of the background, but white in the middle. Basically, it was framed with the background color. So, it seems like the background color is behind the document, but the document color masks the background color out.

Can someone help me change the background color to show on scanned documents?

This topic has been closed for replies.
Correct answer Hoka Hey

So, I found the solution which appears to be scrubbing the background out of the file. Here are the steps:

Step 1 Optimize PDF > Enhance Scanned PDF > Filters > Set Descreen to On and Background Removal to High. Click OK to leave the Filters Menu. Click OK again to Enhance Scanned PDF

Step 2 - Optimize PDF > Enhance Scanned PDF > Click OK. (The filters settings should have remained the same. So you don't have to repeat that part again.

Step 3 - Edit PDF > More > Background > Add > Select the color you want the background you want under Source > Click OK

If anyone can find an easier/better method, please post it.

2 replies

H
Hoka HeyAuthorCorrect answer
Inspiring
May 2, 2017

So, I found the solution which appears to be scrubbing the background out of the file. Here are the steps:

Step 1 Optimize PDF > Enhance Scanned PDF > Filters > Set Descreen to On and Background Removal to High. Click OK to leave the Filters Menu. Click OK again to Enhance Scanned PDF

Step 2 - Optimize PDF > Enhance Scanned PDF > Click OK. (The filters settings should have remained the same. So you don't have to repeat that part again.

Step 3 - Edit PDF > More > Background > Add > Select the color you want the background you want under Source > Click OK

If anyone can find an easier/better method, please post it.

    R
    rg2020
    Participant
    April 3, 2020

    thank you. just needed the first 2 steps to fix the issue. 

    Bernd Alheit
    Community Expert
    Bernd AlheitCommunity Expert
    Community Expert
    May 2, 2017

    The background is behind the scan.

      H
      Hoka HeyAuthor
      Inspiring
      May 2, 2017

      Yes, Bernd Alheit. It appears that the background is behind the scanned. But knowing that doesn't solve the problem. I'm trying to make the document appear to be a different color. How do you do that?

      Since it appears that the background is behind the scanned document, but does not show through, it raises some questions. Why does it show through the digital PDF and not the scanned PDF? My best guess is that the digital PDF has a transparent background (similar to what you can do with a PNG file). If that's correct, how can I make the scanned document's background transparent? Or, if you think of it like layers, how can you bring the colored background that you add forward. (if you could do that, you could reduce the opacity and it would accomplish the goal of making the page appear a different color.)

      Karl Heinz Kremer
      Community Expert
      Karl Heinz KremerCommunity Expert
      Community Expert
      May 2, 2017

      The "digital PDF" does not have a background at all. When you look at the content stream of a page, you will e.g. only see the characters that are being placed, but nothing that would indicate that there is a background. With a scanned image however, there is a background: The scanner reads pixel color values and then stores them. One pixel will be white, the next one gray and that one followed by a black one. These values are then written into your image, which means that at any location within that image, you will find a color (or grayscale) value. None of these pixels are marked as transparent.

      You mention PNG - a PNG file does not necessarily have a transparent background: When you convert your scanned image into PNG, you will also see white pixels, and not transparent pixels, so if you would put a red "background" behind that image, the image would still show black on white.

      There are mechanisms to convert a certain color to transparency. You can for example edit the scanned image in Photoshop, add a background layer, select all white pixels (you may have to do that one by one), and delete them. Now the transparent background will show. There are tools you can use that will also try to select pixels of a certain color and convert them to transparent pixels, but I am not aware of a tool that would do that within Acrobat. You could for example export all your scanned pages as PNG images, and then use the ImageMagick "convert" tool to change white to transparency using this command line:

      convert scan_1.png -transparent white scan_1_transparent.png

      You would then create a new PDF file based on these images.

        Terms & ConditionsAccessibility statement
        Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices