Re: [libreoffice-users] Weird situation with LO Writer

Ra wrote:
> Hello,
>
> I have noticed some unexpected (and possibly inconsistent) behavior of
> documents producet with LO Writer. Here's my scenario: I have several
> frames in the document and each of them has a JPEG photo as the background.
> Each frame has a different image as a background. There are no other
> graphics in the document, just some text. The resulting document ends up
> being considerably larger than the sum of all the images and all the text
> content put together.
>
> Knowing that ODFs are really just ZIP archives, I decided to dig a little
> deeper. Having opened an ODF file with an archiver I noticed most (but not
> all, surprisingly!) of my JPEGs got converted to PNGs before getting
> stored. I don't know much about this but up until now I believed LO stores
> all external images as direct file copies, or at the very least in the
> original format, so this striked me as odd.

Just a guess, but if you copy and paste an image from another file, LO 
won't know what format it was in originally (all it has is bitmap data 
pasted from the clipboard), so will probably use PNG since it is a 
lossless format. Maybe those in JPEG format were inserted by Insert > 
Picture > From file (or similar), while those in PNG format were opened 
in another application, copied from there, and then pasted into LO?

> I've been told the ODF specification recommends using PNGs for bitmaps and
> SVG for vector graphics. This makes sense generally but is also quite
> inefficient for photos as PNG photos tend to be much larger than JPEGs. It
> is also weird that only some of my images got converted.
>
> Anybody know and can explain the logic behind this? My document currently
> contains about 100 such images, the JPEGs are all together about ~15MB in
> size, the rest of the document is mostly plain text with some formatting,
> and yet my document ends up at about ~47MB. I would like to optimize and
> reduce this if possible.
>
> In case it matters, the document was produced over several weeks in LO 4.x
> or newer on Windows (XP/x86 and 7/x64) and Linux (x86).
>
> Thank you.

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