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朱裕85022250
朱裕85022250
Participating Frequently
December 16, 2017
Answered

How to increase the contrast for a PDF file in a batch method

  • December 16, 2017
  • 5 replies
  • 24630 views

I have a pdf file to processing here.

I note I can import the pdf file as a image for every page content. like this

pxmHj.png

I can auto-adjust the contrast by Alt+Shitf+Ctrl+L for every page. Then I will get a very good page like this

sZXWB.png

I have to say I get a larger improvement for this page, but if my pdf have 200+ pages, I don't know how to adjust and export it in batch method. Can anybody help me out?

    This topic has been closed for replies.
    Correct answer c.pfaffenbichler

    That seems to be a fairly suboptimal pdf to begin with … the type appears to be pixels.

    I am afraid the task exceeds Photoshop’s default functionality, but Scripting would provide a work-around:

    Photoshop Scripting

    But mind you: The pages apparently already being images you should open the images, not the pages, to avoid resampling and the ensuing image degradation.

    5 replies

    richdesign00
    richdesign00
    Participant
    February 7, 2018

    This seems like it should be a fairly obvious feature for Acrobat to have - but then Acrobat is a weird product.

    The best I have found is to export the pages as images, batch process each image in Photoshop as required and then use the Photoshop PDF Presentation feature (File/ Automate/ PDF Presentation) to recombine the images back into a PDF with control over the compression (Acrobat seems to compress images if imported directly using Combine files).

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    February 7, 2018
    The best I have found is to export the pages as images

    Which would be a bad idea if the text was type or the pdf contained vector components, which in this case does not seem to be the case, though.

    richdesign00
    richdesign00
    Participant
    February 7, 2018

    I was assuming scanned text, therefore a raster format.

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    December 31, 2017

    Have you made any headway on this issue yet?

    朱裕85022250
    朱裕85022250Author
    Participating Frequently
    May 24, 2018

    Thanks very much. I have make it by c++ and OpenCV afterwards.. Sorry for later response, I have to say I get none notification about your answer totally..

      c.pfaffenbichler
      Community Expert
      c.pfaffenbichlerCommunity Expert
      Community Expert
      December 18, 2017

      But maybe I am misunderstanding your intention and Image Processor would suffice.

      c.pfaffenbichler
      Community Expert
      c.pfaffenbichlerCommunity Expert
      Community Expert
      December 17, 2017

      When you post over n the Scripting Forum please also explain what exact output you want to get: file format, individual images, a re-assembled pdf, …

      c.pfaffenbichler
      Community Expert
      c.pfaffenbichlerCommunity ExpertCorrect answer
      Community Expert
      December 17, 2017

      That seems to be a fairly suboptimal pdf to begin with … the type appears to be pixels.

      I am afraid the task exceeds Photoshop’s default functionality, but Scripting would provide a work-around:

      Photoshop Scripting

      But mind you: The pages apparently already being images you should open the images, not the pages, to avoid resampling and the ensuing image degradation.

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