pdf resolution

Explorer ,
Dec 14, 2020 Dec 14, 2020

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Hello,

I am working in an indesign document that will be printed. In that document I have a pdf file image (that contains only this image). From what I know, there is no resolution in a pdf (or there can be as many as the number of files contained in the pdf).

- But How do I check if my pdf image has a sufficient ppi for my printed document ? 

- Is it ok to convert the pdf file into a psd file with the right ppi ?

Thanks for your help

MK

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correct answers 3 Correct Answers

Adobe Community Professional , Dec 14, 2020 Dec 14, 2020
Also, InDesign’s Preflight will check images inside of placed PDFs:  

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Adobe Community Professional , Dec 14, 2020 Dec 14, 2020
Yes, check the InDesign document before making the PDF. Adobe's online help manual for InDesign is at https://helpx.adobe.com/indesign/user-guide.html   See these sections: https://helpx.adobe.com/indesign/user-guide.html/indesign/using/graphics-links.ug.html https://helpx.adobe.com/indesign/user-guide.html/indesign/using/preflighting-files-handoff.ug.html#define_preflight_profiles   There are 2 ways to check the resolution of graphics in InDesign: 1) Individually, graphic by graphic, or 2) glo...

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Adobe Community Professional , Dec 15, 2020 Dec 15, 2020
MK said: "Ok but if the image inside the pdf is just pixels (photography or drawing without text nor vector file) ?"   Hi MK, then you also could open the PDF in Acrobat Pro DC, select the image and open it with PhotoShop. From there you could save it to a new file and place that file in your layout in InDesign.   Workspace in Acrobat Pro DC: Edit PDF Image is selected. The context menu is showing option: Edit Using > PhotoShop     Regards,Uwe Laubender ( ACP )

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Most Valuable Participant ,
Dec 14, 2020 Dec 14, 2020

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Open the PDF in Acrobat and do a flightcheck there.

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Adobe Community Professional ,
Dec 14, 2020 Dec 14, 2020

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Also, InDesign’s Preflight will check images inside of placed PDFs:

 

Screen Shot 1.png

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Explorer ,
Dec 14, 2020 Dec 14, 2020

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Dear Bob,

 

Thanks for your answers.

According to what you say, it means that we cannot check the image resolution in Indesign unless it is under the ppi minimum requirement ?

Thanks.

MK

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Adobe Community Professional ,
Dec 14, 2020 Dec 14, 2020

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Right, but you can set any minimum.

 

If you want to see the actual resolution(s) inside of the placed PDF you would have to inspect it in AcrobatPro, or preflight the final PDF in Acrobat, which would list all of the image resolutions.

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Adobe Community Professional ,
Dec 14, 2020 Dec 14, 2020

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Yes, check the InDesign document before making the PDF.

Adobe's online help manual for InDesign is at https://helpx.adobe.com/indesign/user-guide.html   See these sections:

 

There are 2 ways to check the resolution of graphics in InDesign: 1) Individually, graphic by graphic, or 2) globally through Preflight.

 

Method #1: Individual graphics.

  • Select the graphic and locate it in the Links Panel.
  • In the lower portion of the panel, you'll see the information about the graphic.
  • Effective Resolution is what matters; it's the resolution that it will be printed at.
  • Usually for press/print, you'll want at least 300 ppi: 400 ppi is preferred for modern printers and quality jobs.
  • Note: This method does not check images inside placed PDFs.

 

Checking a graphic's Effective Resolution.Checking a graphic's Effective Resolution.

Graphics-PPI-1b.png

Method #2: Globally.

  • Select a Preflight Profile and either check its options re: resolution, or create a new profile.
  • Under the IMAGES and OBJECTS section of the profile, select the option Image Resolution, and set the minimum resolution to 300 ppi for color and grayscale images.
  • See Rob Day's screen capture, above.
  • Preflight does check the graphics inside placed PDFs.

 

 

 

Bevi Chagnon | Designer & Technologist for Accessible InDesign + PDFs |
Books & Classes | PubCom

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Explorer ,
Dec 14, 2020 Dec 14, 2020

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Bevi,

Thanks for this detailled solution ! It's so clear now on pdf resolution checking methods.

All the best.

MK

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Adobe Community Professional ,
Dec 14, 2020 Dec 14, 2020

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You're welcome!

One more idea: since InDesign treates PDFs as graphics, then check the PDF's resolution before placing it in InDesign. See @BobLevine's comment above.

 

Use Acrobat's Preflight Tool to check each graphic's resolution, one-by-one. Click each raster/bitmap graphic and check the resolution in the dialogue box.

How to check resolution of a graphic in Acrobat Pro.How to check resolution of a graphic in Acrobat Pro.

 

See this thread for more background details: https://community.adobe.com/t5/acrobat/how-to-verify-the-resolution-of-a-pdf/td-p/9226360?page=1

 

Bevi Chagnon | Designer & Technologist for Accessible InDesign + PDFs |
Books & Classes | PubCom

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Explorer ,
Dec 15, 2020 Dec 15, 2020

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Yes it's a good method to check pdf resolution in Acrobat before importing in Indesign but it does not solve the fact that you have no clue to verify the % size in Indesign unless it is under the minimum resolution defined requirement in preflight that gives you the notification.

Wouldn't it be convenient to convert the pdf image into a PSD file ?

Have a nice day.

MK

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Most Valuable Participant ,
Dec 15, 2020 Dec 15, 2020

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No! You would wind up rasterizing everything.

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Explorer ,
Dec 15, 2020 Dec 15, 2020

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Ok but if the image inside the pdf is just pixels (photography or drawing without text nor vector file) ?

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Most Valuable Participant ,
Dec 15, 2020 Dec 15, 2020

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Then extract the image and use that.

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Explorer ,
Dec 15, 2020 Dec 15, 2020

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Ok well, I didn't know it was possible : Export pdf as tiff ?

Thanks.

MK

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Adobe Community Professional ,
Dec 15, 2020 Dec 15, 2020

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If you find a PDF with an image under the resolution rule, how would you fix the problem—up sample in Photoshop? That solves the resolution rule problem, but doesn’t change the quality problem.

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Adobe Community Professional ,
Dec 15, 2020 Dec 15, 2020

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Why does setting a minimum resolution in the ID preflight not work? If you set it to something like 300 and don’t get an error there isn’t a resolution output problem, if it catches an error in a PDF you’ll know to open the PDF and run a preflight to find the problem image[s]. 

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Adobe Community Professional ,
Dec 15, 2020 Dec 15, 2020

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Which leads us to conclude: There isn't a one-size-fits-all solution to this because PDFs can contain any combination of raster graphics, vector graphics, live text, and rasterized text.

 

My best recommendation is to convert the PDF into a live InDesign file, which then lets me control all the different pieces, view their resolution, and correct things accordingly.

 

Bevi Chagnon | Designer & Technologist for Accessible InDesign + PDFs |
Books & Classes | PubCom

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Engaged ,
Dec 16, 2020 Dec 16, 2020

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Hi there,
just wanted to add for feature reference:
In addition to the great explanations already given, you can set additional columns, including effective ppi, in the links panel. This gives you the possibilty to sort after resolution and then get a quick overview over the resolutions in your indd document.

Click on the flyout menu of the links panel, at the botton "Panel options" and then select to your liking:
Bildschirmfoto 2020-12-17 um 06.44.38.pngLinks panel.png

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Adobe Community Professional ,
Dec 15, 2020 Dec 15, 2020

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MK said:

"Ok but if the image inside the pdf is just pixels (photography or drawing without text nor vector file) ?"

 

Hi MK,

then you also could open the PDF in Acrobat Pro DC, select the image and open it with PhotoShop.

From there you could save it to a new file and place that file in your layout in InDesign.

 

Workspace in Acrobat Pro DC: Edit PDF

Image is selected.

The context menu is showing option:

Edit Using > PhotoShop

 

PDF-in-AcrobatPro-EditUsingPhotoShop-1.png

 

Regards,
Uwe Laubender

( ACP )

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Explorer ,
Dec 16, 2020 Dec 16, 2020

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Hello Uwe,

 

Thanks a lot for this explaination. This is exactly what I what looking for... I think this is more convenient to isolate the file and then to be able to check the size directly in Info Panel or % size in Indesign.

Thanks again.

Regards,

MK

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