Re: [libreoffice-accessibility] support of PDF UA

Hi Christophe,

Op 8-2-2012 16:21, Christophe Strobbe schreef:
> Hi Jaap,
>
> I took the liberty to give it a fuller title (so it is clearer when 
> you search bugs) and changed it to an enhancement request. I hope 
> that's OK :-)
More than OK, thanks for that.
> Before submitting my bug about enabling tagged PDF by default, I asked 
> for opinions on this list, and one of the original OpenOffice.org 
> developers said that it was originally not enabled because of file 
> size, but that this may no longer be an important counter-argument.
> I don't know how PDF/UA impacts the size of PDF files.
Perhaps it would be wise to assess this. In the first place it would be 
nice to know the size difference between a "normal" PDF and a PDF/A-1a. 
Later we can expand this to PDF/UA. It could be that the size grows only 
a fixed amount of bytes. I have just exported a PDF without compression 
and without PDF/A-1a or tagging or hybride and the size is 58 kB. I have 
saved it as a PDF/A1-a and than it is 83 kB. The size growth is 25 kB. 
If this is a absolute size growth than this would mean that a file from 
5. 8 MB increases to 5.8 MB + 25 kB, than I think there is no problem. 
But if it grows to 8.3 MB, than it is probably not wise to have PDF/A1-a 
or PDF/UA as a default option. I assume (hope) that this research has 
been done already by someone in the community?
> > > "PDF/A-1a" or should it be an additional checkbox?
> >
> > PDF/A-1a is also used for archive, id est that is the default 
> > function of A-1. I am no expert, but I should say that A-1a should be 
> > possible too. So PDF/UA would be an extra checkbox. But I think this 
> > should be questioned to some experts.
> > 2) In the PDF Options dialog box, should "PDF/UA" replace the current
>
> Apparently, I temporarily forget that the A in PDF/A (ISO 
> 19005-1:2005) stands for archiving instead of accessibility :-/
> Anyway, checking PDF/A-1a leads to a few specific UI changes:
> 1. The "Tagged PDF" checkbox is checked (if it was not already 
> checked) and greyed out.
> 2. The "Create PDF form" checkbox is unchecked and greyed out.
> 3. The "Embed standard fonts" checkbox is checked and greyed out.
>
> If PDF/UA is added as a checkbox above or below PDF/A-1a, should the 
> "Tagged PDF" checkbox also get checked and greyed out? Are there any 
> other things that should happen? (I suppose I could ask Duff Johnson 
> directly.)
I am no expert, but I think that tagged PDF should be greyed out. 
Perhaps PDF/A1a too? I should say: ask the expert :)

Kind regards,
Jaap van de Putte

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