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On Wed, 16 Jan 2013, Tom Davies wrote:

Hi :)
Do you know if it isn't?


the conclusion?

I wouldn't assume I could depend on its results without further investigation. that's why I asked the OP why this particular test instrument.

  I think it's a good idea to check the integrity of Pdfs that are output.


  often we focus tooo much (imo) on the integrity of MS formats which will always look different on every machine.  People seem to be using Pdfs quite a lot more now and it would be nice to know that ones we create work properly, or at least consistently.

we also need to know our pdf readers work properly or at least consistently.


If specific potential problems can be pinned down then i think we are in a better position to have more confidence in our outputs.  Bear in mind that Pdf output is significantly better in LibreOffice than in MSO.  LO offers far more options and some of those improve accessibility (specifically better for screen-readers) and for uncompressed or more compressed output.  MSO offers freedom FROM choice. 

Regards from
Tom :) 

From: Felmon Davis <>
To: Sent: Wednesday, 16 January 2013, 4:23
Subject: Re: [libreoffice-users] Quality Assurance

On Wed, 16 Jan 2013, C. H. D. wrote:


Thanks for this idea. I report a bug related to LibreOffice.

I guess, there must be something different if DiffPDF says the two PDF files are different. (maybe 
visible in Document Viewer (Evince) or in Adobe Reader)

I look for that difference and report the bug accordingly.

(to repeat the question) you are certain diffpdf is reliable?


C. H. D.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _

--- 2013年1月16日 星期三,Felmon Davis <> 寫道﹕

寄件人: Felmon Davis <>
主題: Re: [libreoffice-users] Quality Assurance
日期: 2013年1月16日,星期三,上午7:13

On Wed, 16 Jan 2013, C. H. D. wrote:


Recently, I started learning more about computer software. (I am new and I do not know too much 
about programming.)

I do not know how to rate the quality of the office application. If I say this is good, I will expect that the document is displayed in the _same_ way, e.g. in the previous version and the next version and the subsequent version and the future versions.

I spent some time on doing (experimenting?) this. I searched the Internet and looked for 
OpenDocument files I can download. They are random (just searched by some random keywords).

I did:
LibreOffice 3
File -> Export as PDF -> PDF/A-1a -> Export

LibreOffice 4
File -> Export as PDF -> PDF/A-1a -> Export

There were tens of files. I used DiffPDF to compare the differences. If I notice a difference, I 
will report a bug.


do you report a bug about LO or a bug about DiffPDF?


-- Felmon Davis

According to all the latest reports, there was no truth in any of the
earlier reports.

Felmon Davis

If there are epigrams, there must be meta-epigrams.
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