Finding Image resolution in PDF file?

Posted by Dave on Super User See other posts from Super User or by Dave
Published on 2011-11-21T16:22:30Z Indexed on 2011/11/21 17:56 UTC
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pdf

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images

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resolution

I have a problem of having some users creating very large PDFs. On the other hands I have PDF sent from our fax machines that are really small in size and totally printable. My question is

Is there any way I can find the resolution (DPI) of the PDF. I search the internet, could not find any answer. Checked the properties of the file, this information was not stored there, at least in my case.
What is the optimum resolution of converting text file into image PDF. 96dpi, 300dpi or more ?
Fun question. Can I resize a PDF which was scanned with high dpi into smaller dpi?

I know some answers might not be available as I have already searched the internet and could not find answers.

Note: My PDF are entirely images, text to images. I am also familiar with primoPDF (free) something you can experiment with

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