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

TomD wrote
> 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?

Yes, there is a difference, comparing 4.3.4.1 and 4.4.0.0. The file size was
what alerted me: it has been reduced from enormous to a reasonable size. For
example, the latest community magazine comes out as a 169Mb PDF with 4.3.4.1
and just 30Mb with 4.4.0.0.

Every example that I've looked at shows that pictures are either stored in
their original format, or converted to PNG (if not already PNG) and made
larger. The difference is that 4.3.4.1 seems to do it with most images,
whereas 4.4.0.0 with very few.

When a specific image is converted by both 4.3.4.1 and 4.4.0.0, the
resulting file is identical, which suggests that the algorithm has not
changed; only the decision whether or not to convert has changed.

As for a pattern, I've not been able to find one. As mentioned before, there
seems to be no pattern as to whether the images are linked or embedded,
large or small, resized or not.

It seems random. I'm sure it's not random, but still, I find it crazy to
modify any of the images especially as they are always made larger (why take
a lossless PNG image and make it into a bigger PNG?).

Paddy



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