[libreoffice-users] Re: How does 4.4 compress PDFs so well? Is there a quality problem?

V Stuart Foote wrote
> A printed copy of your PDF is not a very good test of document quality.
> Embedded BMP representation within LibreOffice is at 300dpi.  Export print
> may be the vector format  (wmf, emf, eps, svg) or a bitmap rendering
> preview--at 300dpi. 
>
>  You really need to open each PDF in suitable viewer and zoom in to 800%
> or 1200%.  How do embedded  images compare there? Are they bitmap?  Or
> more concise full resolution vector images?
>
> Also, the platform you work on will impact handling of vector images.
> Several helper programs are needed--Ghostscript, ImageMagick, pstoedit and
> the mix will impact handling as bitmap or vector.

To clarify:

All original images are either JPG or PNG.
I don't need super-clear printing, as this is a simple non-profit
volunteer-run community magazine.
I have zoomed the two files to 6,400% in Adobe Reader XI on Windows, and
they look identical.


V Stuart Foote wrote
> Please provide your OS details, and perhaps attach a sample output (via
> the Nabble interface).

I am using Linux Ubuntu 14.04 64-bit.

One of the files is too large for the Nabble interface, and so I am
including links to the files instead.
*  PDF from version 4.3.4.1
<https://dl.dropboxusercontent.com/u/49313422/Version%204.3.4.1.pdf>  
*  PDF from version 4.4.0.0
<https://dl.dropboxusercontent.com/u/49313422/Version%204.4.0.0.pdf>  

My suspicion now is that the current version converts the images to a
bitmap, whereas the new version saves the images in their original format.
Is there a way to look "inside" the PDF to see how the images are stored,
either on Windows or Linux?

Thank you for looking at this.

Paddy



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