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.PDF Unsharpen Mask

  1. When I add a .PDF file to my media, the pages are displayed with an unsharpen mask that makes the pages barely readable. I made sure the original .PDF files are without an unsharpening mask. How can I turn this off?

    The blog I need help with is

  2. Hi,

    My apologies for the delay. Can you send a link to a blog post with a PDF with the issues linked, or a link to the PDF itself?

    I'm not aware of any type of file modification occurs upon upload.


  3. Hi,

    I am sorry for the delay in replying, I created a new email account for the blog and forgot to check it for messages...

    Here is the link to the .PDF file inserted as a media:

    Please notice the unsharpen mask which makes the article (in Hebrew) barely readable.

    Thank you very much, appreciate your help.

    Yuval Goldstein

  4. Hmm, something of note that may or may not be the issue.

    When I open the PDF using Chrome's built-in PDF viewer, there is some sort of interference that makes the first page, in particular, hard to read.

    When I open the same PDF using Window 8's viewer, that interference is not visible. I haven't checked it using Adobe Acrobat or Acrobat Reader nor any of the viewers on my Ubuntu Linux box yet.

    My initial thought is that WordPress didn't modify the file, but the original PDF has some layer that is rendering poorly in some viewers, which happen to include the Chrome viewer.

    Can you try downloading the PDF and opening it up in a different viewer? Are you seeing the same results I am?

  5. Is the PDF a scanned document?

  6. Thanks for your reply. I did try to open the .PDF file in both Acrobat Reader and SodaPDF2012. In both the docs display fine.

    It is true that the first page in particular is hard to read, and one can see the mask. However the later pages still appear almost unreadable.


  7. Hello auxclass,

    Yes, the PDF is a scanned document. I tried several resolutions: 600 DPI, 300 DPI, 150 DPI. In any lesser resolution I don't get a satisfactory result in Acrobat Viewer, i.e. the text, which is in small font, does not appear readable (and please notice, I am not referring to the display of the PDF in the blog).



  8. If you scanned directly into PDF the conversion can be tough

    I have sometimes scanned into an image file and then worked the image over a bit with something like Photoshop or Gimp to get an image that is easier to read - then convert back to PDF

  9. I believe it is an issue with Google Chrome's PDF renderer and not have anything to do with WordPress. It displays fine in IE or Acrobat reader. There seem to be other reports of problems with Chrome rendering pdf documents

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