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As the title says how would I determine the dpi of a pdf or a djvu document?

I am looking for a proper linux solution as opposed to running adobe acrobat professional under wine.

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PDF files per-se are vector graphics and can be scaled indefinitely . Some embedded elements, such as images, can be raster images. Is it the DPI of these elements you want to know? – Glutanimate Apr 5 '13 at 21:33
Yes maybe I'll see if I can perform a lossless extract say png and determine the dpi of the image that way. It's an image I am dealing with in the pdf, no text. I'll update if I discover anything. – user140393 Apr 6 '13 at 0:32

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