May 24, 2018  I can auto-adjust the contrast by Alt+Shitf+Ctrl+L for every page. Then I will get a very good page like this Then I will get a very good page like this 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. I’m using Adobe Acrobat Pro 11. But you can follow my steps to have a try: 1. Launch Adobe on your computer and go to Edit Preferences. In the pop up window, select Accessibility on the left categories.

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• Dec 16, 2017  I can auto-adjust the contrast by Alt+Shitf+Ctrl+L for every page. Then I will get a very good page like this Then I will get a very good page like this 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.
• Dec 01, 2016  Launch Adobe on your computer and go to Edit Preferences. In the pop up window, select Accessibility on the left categories. Then in the Document Color Options section, you can choose Contrast.
• May 05, 2016  You have to tweak your Adobe Reader settings separately to view PDFs with high contrast. Here’s how to do it: If you open the Adobe Acrobat Reader program without opening a file, the program window should respect your existing high contrast colour scheme. Then, go to the main menu and choose Edit Preferences.
• If you have Adobe Acrobat /Reader XI and the document is not a scanned one and the words are 'real' text (not part of an image) you can go to menu Edit (Win) or Acrobat (Mac) - Preferences, choose Accessibility category and enable 'Replace Document Colors' to choose a custom color to the document text.
• High contrast mode is great for readability, but if you’re trying to read a PDF, you’ll need to do some tweaking in Adobe Reader. We’ll walk you through it. Microsoft Windows’ High Contrast colour scheme is a built-in accessibility setting that helps improve readability. It uses a black.

We get PDF's from our professor to read for homework but they're often scanned documents, is there a way to adjust the contrast of the text to make it easier to read?

Edit: I've got Photoshop but is there a way to do it from a PDF reader?

Edit2: Windows XP, 7 ** Windows or Ubuntu Only **

wag2639wag2639

10 Answers

You can try this:

Go to Edit>Preferences>Accessibility

This will not change the true contrast, but you can pick contrasting colors of your choice, or one of the defaults, as in the screenshot.

KCotreauKCotreau

You could try Imagemagick - it's a graphics manipulation program that can read and write PDFs too.

There are a few command line options that may help - for example: -normalize, -contrast and -contrast-stretch

Try something like: convert original.pdf -contrast new.pdf

More info and examples on the site.

Linker3000Linker3000

Under OS X, you can use ColorSync which is installed by default. There are many filters, and one is for decreasing contrast.

slhck

What I did was change the color of the text by going to edit menu, clicking on preferences and then the accessibility tab. You can customize the color for the document text. It doesn't do anything for the images, but at least you can see the text on a dark background.

I saved it as a Microsoft Word file in Acrobat Reader. Then I opened the Word Document and adjusted the brightness and contrast of the image until it was readable. It makes for an expensive print, but it works.

If you open it in Photoshop and resave as a PSD file you can or if you want to apply on all pages, do the following:

1. Open the pdf in Preview.
2. Make sure the preview pages are showing
3. Click page one
4. 'Select All' (or Command + A), All pages are selected
5. Run any Preview tool/filter and all pages will be affected simultaneously

If your pdf is locked, you will not be able to perform this operation. Alps 5000 windows 10 driver update.

r0car0ca

I've run into this as well. for some reason version 5 of the reader seems to work as expected. I think it might be something in the creation, but I've not tracked it down yet.

I changed contrast with PDFClerk. It has a lot of filters in there, when exporting PDF.

holmsholms

You can use the graphics card or monitor settings to handle this.

See this post as well.

For that you could use a system wide gamma/brightness/contrast setting; usually if you have a modestly advanced graphics card, its control panel will have options to change gamma / contrast / brightness / hue. e.g. NVIDIA control panel, ATI Catalyst Control Center/Panel etc. It will affect the the whole system, but you can always change it back when you're done viewing the file.

Mehper C. PalavuzlarMehper C. Palavuzlar

You can also try Nuance Paperport (I got this 'free') with my Brother MFC scanner/printer.

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Essentially if you have a dark grey font on a light grey background (a low contrast scan), then you tell it to 'stretch' the dark grey to black and the light grey to white. This is done by setting the black/white points as follows:

• Open Paper port, navigate to the PDF
• Right click the PDF within PaperPort
• 'SET Tools'
• Auto-enhance (or Apply current white/black points)

Now you can manually set the while/black points for finer control

• Open Paper port, navigate to the PDF
• Right click the PDF within PaperPort
• Open with ImageView
• In the top ribbon, pick 'White point' and now click some area of the scanned page you think should be white (eg: grey background of a low contrast scan).
• In the top ribbon, pick 'Black point' and now click some area of the scanned page you think should be black (eg: The grey text letters of a low contrast scan)

I used this to create a legible black and white PDF from a scan that was originally black text on dark blue paper (that scans as a very low contrast)

DeepSpace101DeepSpace101

protected by BinaryMisfitNov 8 '10 at 11:19

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We get PDF's from our professor to read for homework but they're often scanned documents, is there a way to adjust the contrast of the text to make it easier to read?

Edit: I've got Photoshop but is there a way to do it from a PDF reader?

Edit2: Windows XP, 7 ** Windows or Ubuntu Only **

wag2639wag2639

10 Answers

You can try this:

Go to Edit>Preferences>Accessibility

This will not change the true contrast, but you can pick contrasting colors of your choice, or one of the defaults, as in the screenshot.

KCotreauKCotreau

You could try Imagemagick - it's a graphics manipulation program that can read and write PDFs too.

There are a few command line options that may help - for example: -normalize, -contrast and -contrast-stretch

Try something like: convert original.pdf -contrast new.pdf

Adobe Pdf Change Margins

More info and examples on the site.

Linker3000Linker3000

Under OS X, you can use ColorSync which is installed by default. There are many filters, and one is for decreasing contrast.

slhck

What I did was change the color of the text by going to edit menu, clicking on preferences and then the accessibility tab. You can customize the color for the document text. It doesn't do anything for the images, but at least you can see the text on a dark background.

I saved it as a Microsoft Word file in Acrobat Reader. Then I opened the Word Document and adjusted the brightness and contrast of the image until it was readable. It makes for an expensive print, but it works.

If you open it in Photoshop and resave as a PSD file you can or if you want to apply on all pages, do the following:

1. Open the pdf in Preview.
2. Make sure the preview pages are showing
3. Click page one
4. 'Select All' (or Command + A), All pages are selected
5. Run any Preview tool/filter and all pages will be affected simultaneously

If your pdf is locked, you will not be able to perform this operation.

r0car0ca

I've run into this as well. for some reason version 5 of the reader seems to work as expected. I think it might be something in the creation, but I've not tracked it down yet.

I changed contrast with PDFClerk. It has a lot of filters in there, when exporting PDF.

holmsholms

You can use the graphics card or monitor settings to handle this.

See this post as well.

Change Contrast Adobe Pdf File

For that you could use a system wide gamma/brightness/contrast setting; usually if you have a modestly advanced graphics card, its control panel will have options to change gamma / contrast / brightness / hue. e.g. NVIDIA control panel, ATI Catalyst Control Center/Panel etc. It will affect the the whole system, but you can always change it back when you're done viewing the file.

Mehper C. PalavuzlarMehper C. Palavuzlar

You can also try Nuance Paperport (I got this 'free') with my Brother MFC scanner/printer.

Essentially if you have a dark grey font on a light grey background (a low contrast scan), then you tell it to 'stretch' the dark grey to black and the light grey to white. This is done by setting the black/white points as follows:

• Open Paper port, navigate to the PDF
• Right click the PDF within PaperPort
• 'SET Tools'
• Auto-enhance (or Apply current white/black points)

Change Contrast Adobe Pdf Online

Now you can manually set the while/black points for finer control

• Open Paper port, navigate to the PDF
• Right click the PDF within PaperPort
• Open with ImageView
• In the top ribbon, pick 'White point' and now click some area of the scanned page you think should be white (eg: grey background of a low contrast scan).
• In the top ribbon, pick 'Black point' and now click some area of the scanned page you think should be black (eg: The grey text letters of a low contrast scan)

I used this to create a legible black and white PDF from a scan that was originally black text on dark blue paper (that scans as a very low contrast)

DeepSpace101DeepSpace101

protected by BinaryMisfitNov 8 '10 at 11:19

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?

Adobe Pdf Free Download

Not the answer you're looking for? Browse other questions tagged pdfcolorsadobe-acrobatcontrast or ask your own question.