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

Hi :)
I think this is tooo new so no-one really knows yet!

Is there a difference between freshly created new documents done in the
4.4.0 compared with documents created in previous branches?  Does that help
with figuring out a pattern or is that a "red herring"?
Regards from
Tom :)



On 20 November 2014 13:25, Paddy Landau <paddy@landau.ws> wrote:

> V Stuart Foote wrote
> > Hey that was fun to track down.  You were spot on...
> >
> > Looks like a long present issue of JPEGs being exported to PDF were not
> > retaining their JPEG compression…
>
> Thanks for that, Stuart.
>
> I have tested further using GIF, JPG and PNG images, opening PDFs in
> LibreOffice Draw and exporting the graphics (right-click > Save Graphic…).
>
> Comparing the files to the originals, the story seems complicated.
>
> Sometimes, the original images are stored without change, and sometimes
> with
> change (always larger and as PNG, even if the original is PNG). But I
> cannot
> find a pattern. It doesn't matter if the images are large or small,
> embedded
> or linked, resized within the document or at their original sizes.
> Furthermore, sometimes 4.3.4.1 does save the images as the original. Again,
> I can discern no pattern.
>
> It seems entirely random to me.
>
> The link that you gave is, unfortunately, too technical for me, so I can't
> use that to figure out why it sometimes stores the images as their original
> and sometimes not.
>
> At least the new PDF files are significantly smaller, without losing
> resolution.
>
> Perhaps someone with technical understanding can weigh in to explain when
> 4.4 saves an image in its original format and when it converts to PNG
> (sometimes already PNG, just made larger) — and why? What is behind the
> decision to *sometimes* change the format to PNG or, when already PNG, to
> make it larger?
>
>
>
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