Categoria: pdf

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Split columns in a pdf

It can happen that you have a pdf with two columns in a page

such as in this image pdf 2 colonne

and you want to split them (i.g. because the ocr is not correct, and you have a text as if was an only column).
A website very useful and easy to make this is online2pdf.

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pdf editor (linux)

The best pdf editor in linux is, IMO, Master PDF. That is not, however, an open source application: to get its full function you must buy a (quite expensive) license.
You can bypass this problem using a previous pdf master release, that have less features, but all free. Remember to lock (pin) this relaese, otherwise your software manager will update it to the new ones.

There are others pdf editor, but not so good

  • LibreDraw i.g. can edit a pdf, but the result a very untidy (detroying original formattation) and huge-sized (4 or 5 bigger than the original one) page.
  • Scribus can edit a pdf, but not the outlines, and in a very poor mode. Moreover big pdf files are a problem for Scribus.
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link from outside to a part of a file

pdf

It is possible to link a page of a pdf, with the following syntax:

file:///your-path-here/your-pdf-filename-here.pdf#pag=[the-page-number]

or, if the file is within your localhost folder

http://localhost/your-path-here/your-pdf-filename-here.pdf#pag=[the-page-number]

epub

It is possible to link to a given location of an epub file, i.g. with calibre viewer, with a code like the following

file:///your-path-here/your-epub-filename.epub?open_at=epubcfi(/10/2/4/2/132/18/1:65)

You can get the string after open_at (in the above case: epubcfi(/10/2/4/2/132/18/1:65) in the calibre viewer, this way:

  • right click
  • -> go to
  • -> location
  • -> current location (above in the window) : copy

video file

with VLC you can use this code

vlc file:///my-path/my-video.mp4 --start-time=90

where ’90’ are the seconds (after the start of video).

I didn’t manage, so far, to open a video with such a code from a browser.

audio file

You ca do it in several ways. With play (sox) in Linux you can use a code setting not only the start time, but the end one as well: 

play '/your-path/your-file.ogg' trim 5:18 =7:01

where 5:18 is the start time, and 7:01 the end one (=7.01 and not = 7:01)