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How to determine and alter dpi of a PDF?

Sep 26, 2012 1:21 PM

I have a 70 page PDF and would like it to be searchable, and to run OCR on it.  The error message is:

 

Acrobat could not run Paper Capture because of the following error: This page is of unsupported resolution, so it cannot be captured.  Supported resolutions are 200-600 dpi for b/w and 200-400 dpi for gray/color.  

 

How do I determine the dots per inch (dpi) of the  document and how to increase or decrease it?

 
Replies
  • Currently Being Moderated
    Sep 26, 2012 3:04 PM   in reply to cicorporation1

    PDF files do not have a resolution. Only images do. You should be able to find out with the Preflight tool. But you cannot fruitfully increase or decrease the dpi. You need to rescan at the proper dpi using the scanner's settings to determine what dpi you want to scan with.

     
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    Jul 16, 2013 6:08 AM   in reply to MichaelKazlow

    What do you use in preflight to check the dpi of images?

    Thanks.

     
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  • Currently Being Moderated
    Jul 16, 2013 8:38 AM   in reply to nuitgoddess

    You can create a custom profile that will list what you want.2013-07-16_11-37-38.png

     
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  • Currently Being Moderated
    Jul 16, 2013 10:34 AM   in reply to MichaelKazlow

    How does ppi translate to dpi?

     

    My print vendor says I have a PDF file with images printing  at 150 and

    usually we print at 300 dpi.

    How can I tell what I have sent to him?

     

    ~~~~~~~~~~~~~~~~~

    Deborah  :->

     
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  • Currently Being Moderated
    Jul 16, 2013 10:41 AM   in reply to nuitgoddess

    ppi and dpi are basically interchangeable (ppi is more correct for an image, dpi for a scanner setting).

     

    You can find the lowest limit of the ppi used by adjusting your preflight rules, and test it. Bear in mind there isn't a DPI value for a PDF. Each image is potentially different.

     
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