pdftk: tildes y caracteres especiales en metadatos de pdf

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— my apologies to the english readers, this is related to spanish special characters so the post will only be written in spanish—

Ahora que ya sabemos instalar, extraer y modificar metadatos de los pdf usando pdftk podemos pasar al siguiente nivel: ¿cómo codificar las tildes en, por ejemplo, los autores?

Si usas un fichero como el siguiente para modificar los metadatos, se producirán fallos al almacenar las tildes (línea 3):

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InfoKey: Title
InfoValue: On the Asymptotic Determination of Invariant Manifolds for Autonomous Ordinary Differential Equations
InfoKey: Author
InfoValue: Palacián, J.
InfoKey: Producer
InfoValue: Revista de la Real Academia de Ciencias de Zaragoza
InfoKey: ModDate
InfoValue: D:20021212160539+01'00'
InfoKey: CreationDate
InfoValue: D:20021212160539+01'00'
PdfID0: 74f6cec73badf5b81956f05090f5af37
PdfID1: 74f6cec73badf5b81956f05090f5af37
NumberOfPages: 60

Para saber cómo tenemos que codificar los caracteres ‘extraños’ (con tilde, eñe, etc) se puede consultar la lista de códigos html

Siguiendo estas normas, nuestro fichero de entrada de metadatos será ahora:

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InfoKey: Title
InfoValue: On the Asymptotic Determination of Invariant Manifolds for Autonomous Ordinary Differential Equations
InfoKey: Author
InfoValue: Palacián, J.
InfoKey: Producer
InfoValue: Revista de la Real Academia de Ciencias de Zaragoza
InfoKey: ModDate
InfoValue: D:20021212160539+01'00'
InfoKey: CreationDate
InfoValue: D:20021212160539+01'00'
PdfID0: 74f6cec73badf5b81956f05090f5af37
PdfID1: 74f6cec73badf5b81956f05090f5af37
NumberOfPages: 60
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Install pdftk from sources in Linux RedHat

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Yesterday I talked about pdftk and how to modify pdf metadata using this software.

Well, today I’ll show you how to install this great tool in your Redhat systems. In my case, I am using:

$ uname -r
2.6.18-164.9.1.el5

This are the steps I followed:

  • Download the last version available: 
    wget http://www.pdfhacks.com/pdftk/pdftk-1.41.tar.gz
  • Extract the tar contents: 
    tar -xzvf pdftk-1.41.tar.gz
  • Now change to that directory, check your corresponding Makefile’s variables (TOOLPATH, VERSUFF which in my case are empty) and then proceed to compile: 
    cd pdftk-1.41/pdftk
make -f Makefile.RedHat
strip pdftk

    Note the last strip command? It is done to reduce the resulting filesize 😉

  • Last step, complete the installation (as root): 
    make -f Makefile.RedHat install

Now you can use pdftk 😉

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Extract / modify PDF metadata (using pdftk)

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PDFTK is a free, open source PDF toolkit. It is one of my preferred tools to deal with pdf metadata. It runs in Windows and Linux platforms.

For instance, you can read the pdf metadata:

$ pdftk original.pdf dump_data output data.txt
$ cat data.txt
InfoKey: Creator
InfoValue: Writer�
InfoKey: Producer
InfoValue: OpenOffice.org 3.1�
InfoKey: CreationDate
InfoValue: D:20090923135542+02'00'
PdfID0: e5d831c33f77ac694b32456732f2c86
PdfID1: e5d831c33f77ac694b32456732f2c86
NumberOfPages: 1

And you can also modify the pdf metadata:

$ pdftk original.pdf update_info data.txt output resultado.pdf

Note the data.txt must be in a correct format!

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