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In order to extract a part of a PDF page on a Gnu/Linux machine I use the following command:

gs -sDEVICE=pdfwrite -o out.pdf -g2300x2300 input.pdf

The -g...x... option lets me choose coordinates on the input PDF. So, here is my question:

  1. How do I shift the coordinates so that any rectangle on the input PDF might be chosen?

and extending that question:

  1. Is there any graphical interface that allows choosing the coordinates I want? (so far it's trial and error.)

I do not want to extract whole pages from the input PDF.

The output format should again be PDF. I am not looking for extraction of text or images.

A similar question had been asked on askubuntu.org, but the answers only deal with extracting whole pages or page ranges. I know I can do that with pdftk.

A yet more specific question similar to this on was asked here before, but remained unanswered.

On a Mac this whole affair is absolutely simple: The program preview has a function for exactly that. How do I snapshot a part of a single PDF page to output format PDF?

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You could give pdfjam a try, which accepts parameters like --trim '1cm 2cm 1cm 2cm' --clip true (and more parameters the LaTeX package 'pdfpages' has) "to trim those amounts from left, bottom, right and top, respectively, of input pages", like the '--help' output for the program states.

  • and then trial and error until I get the margins right? – fborchers Jan 27 at 15:19
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    unfortunately, yes. By the way: here is a ghostscript answer: askubuntu.com/a/592206 – Jaleks Jan 27 at 20:03
  • @jaleks, I tried the solution you linked to but it didn't crop the image when I tried it on a pdf containing svg graphics. One useful thing thing I did find out reading info gv is that there is a config file which, if you set the GV.saveposFilename variable , appends the current mouse ordinates to a file on each z keypress. – bu5hman Jan 29 at 18:25
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I use document snippets a lot but I haven't seen a GUI way to extract pdf snippets directly.

That said, a precise snippet selection can be made through Okular or with Spectacle and the result saved as png, which I know you said you didn't want, but ..... you can get back to pdfs if you run this on the directory you saved the snippets to

for i in *.png; do convert $i ${i%.*}.pdf; done

The question you referenced is not so much to do with just 'grabbing a piece of a document' but reverse engineering curves without having the base point/plot data. Different animal to the question you phrased.

  • Okular seems a good choice to display the size of the rectangle. However, converting to png pixelizes the image. I do want the vector graphics. – fborchers Jan 27 at 15:17
  • That's true, though I usually dodge the resolution issue by enlarging the image on the screen and since most of my work is processed scans I am never going to get VG quality out. So you are saying 'Preview' effectively take a viewport from a VG rendering? Interesting. – bu5hman Jan 27 at 17:02
  • The long way round you can crop in inkscape and print the cropped image to pdf. Once you open the new pdf you can manipulate the viewported svg or copy it into another pdf. – bu5hman Jan 27 at 18:32

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