I got a 200 MB PDF with just a 6x4" picture in it. I am curious to see how many DPI it has been scanned, but if I open it in Photoshop, it asks me to render it again, so it won't be the original data.

So how I can get information about the images embedded in the PDF?

  • Moreover, images in a PDF are all encoded in JPG, right? I think this guy scanned at 9600 DPI "because it's better quality" – Magnetic_dud Sep 8 '18 at 8:29
  • Related answer – user120647 Sep 8 '18 at 9:02
  • @Danielillo but that requires Acrobat Pro – Magnetic_dud Sep 10 '18 at 6:07

How to Check DPI of Images in PDF's with Photoshop

  1. Open your PDF with Photoshop, then select Images and choose the image you want to check.

enter image description here

  1. Now press Ctrl+Alt+i

enter image description here

  1. The resolution used is now shown in the resolution area.

*This will not work if you open multiple images. A PSD can only support one resolution at a time.

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