Skip to main content
Giulia225177485jl0
Participant
Jan 5, 2022 4:13 PM UTC
Answered

dpi in pdf

How can I check and possibly change the dpi of images in a pdf file using Adobe Acrobat Pro? I'm using Windows 11

This topic is closed to new replies. Start a new post to keep the conversation going.
Luke Jennings3
Luke Jennings3Correct answer
Community Expert
Jan 5, 2022 4:32 PM UTC

Another option is to go to Tools> Print Production> Output Preview, change the Preview: to Object Inspector, click on an object. You can open the image in Photoshop (Tools> Edit pdf> Edit using:> Photoshop) where you can  change the dpi, or optimize the pdf to downsample all images, File> Save as other> Optimized pdf.

View reply

6 replies

Dave Creamer of IDEAS
Community Expert
Dave Creamer of IDEASCommunity Expert
Community Expert
Jan 5, 2022 4:59 PM UTC

This is what I call a "desperation mode" process:

Right click on the image. (It should open in Photoshop; if not, check your Acrobat preferences.)

In PS, turn on resample and adjust the resolution. 

Save--it will update in the PDF.

Repeat as necessary.

 

If you add too much resolution this way, you will soften the image. You can try running some Smart Sharpen, but nothing will make it as good as having enough resolution to begin with. However, I look it as better to have a slightly soft image than a pixelated image. 

I've attached a PDF comparing a high-res, a pixelated, and an up-sampled image. 

Translate
David Creamer: Community Expert (ACI and ACE 1995-2023)
Document Geek
Community Expert
Document GeekCommunity Expert
Community Expert
Jan 5, 2022 4:22 PM UTC

Do you want to increase or decrease the resolution? If decrease, you can optimize the PDF.

 

If increase, there is no way to do that in Acrobat.

 

To check the resolution, use Preflight.

 

Translate
    Giulia225177485jl0Author
    Participant
    Jan 5, 2022 5:35 PM UTC

    I want to check that the images are not more than 300 dpi, they can be even less. Can you explain to me how I can check and decrease the dpi? The images are a lot because is a portfolio of 100 pages. Thank you!

    Translate
    Dave Creamer of IDEAS
    Community Expert
    Dave Creamer of IDEASCommunity Expert
    Community Expert
    Jan 5, 2022 5:49 PM UTC

    As @Document Geek suggested, use PDF Optimizer

     

    Translate
    David Creamer: Community Expert (ACI and ACE 1995-2023)
    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices