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Old 09-03-2015, 09:39 AM   #1
Pscylo
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Registered: Mar 2008
Distribution: Slackware 13.37 64bit & 32bit
Posts: 48

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Editing PDFs - a slight revelation including some questions about sed


Hi,

I have fairly regular requirements to edit PDFs, though more often than not it's just the page geometry I'm messing with (impostion for printing - bursting printers' pairs apart,that kind of thing). As you might expect I work in a branch of printing. On Windows the professional version of Acrobat had some capabilities which I found hard to replicate on Linux but I did find a few options that fulfilled (so far) all of my needs.

So, as mentioned, it's normally geometry I mess with, so Media, Bleed, Crop, Trim and Art box parameters are my main focus. I did find PDFedit did a few useful things, but it wasn't so helpful with multipage files.

So then I used Vim with the pdftk plugin installed, and that worked fairly nicely, and would alter the X number(sometimes over 100) instances of the various box parameters that I need to alter; but it was sloooow. Very slow.

Then the revelation, since we're altering lines, why not try sed. Well it works and it's really quite fast the only problem is that I wind up with a PDf that it's thereafter difficult to maniulate, I presume because the "Xref table" is messed up? Not too sure about the vagaries of postscript, so I'm just guessing here.

I can fix the problem using pdftk (which takes a while - just nothing like as long as using Vim), but if possible I'm keen to avoid this delay, as if nothing else, I could script most of the processes and remove a lot of tedious tasks involved. Wite error it inserts it's not ideal to script since I need to check at each stage.

So to the (linux)question:

What is it that sed is doing that's likely causing the problem?

&

How can I avoid it?

Like I say I can live with it, would just prefer not to.
 
  


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