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Re: [libreoffice-documentation] Meeting Minutes of the documentation team 5/29/2019

On 30/5/19 10:00 pm, Olivier Hallot wrote:

Em 30/05/2019 03:53, Luke (gmail) escreveu:
On 30/5/19 5:40 am, Olivier Hallot wrote:
+ Graphics:
     + Drawings in Draw are objects when embedded in Writer
     + Convert OLE object into image
         + Use PNG format. JPEG has quality trade-off.

Is this just in reference to a specific guide?  It's surely not a
general recommendation, I hope?

In Draw you have the full object description. Often the drawing will be
vector art, or largely vector art.  So preserving that information
instead of throwing it away is critically important for the use case of
wanting to produce a printed book, or just a print.

Any bitmap format is lossy WRT the original vector graphics.

May I request, since Writer supports SVG, you save the object as an SVG
image?  That way the vector parts can stay vector, the image parts as
image, and it supports transparency too.  (I would have said EPS until I
remembered it doesn't support transparency in its compositing model.)

Forcing it to a bitmap image type introduces the question of what
resolution to choose, and then of course the problem that you need a
high-res if it might be needed for printing but a low-res is all that's
needed if it never will be.

(I'm assuming in all this that the OLE object - which would allow
round-tripping with Draw, presumably - is for some reason a problem?)




Office supports its "Windows Enhanced Metafile" image format for exactly
the reason that it preserves linework, and so you can enlarge or print
with good quality.

I'm glad to hear that it was a narrow topic and I misunderstood the context. But...

Hi Luke

You are right in principle, if we stay in the LibreOffice editing

The issue raises when you export to other formats such as mediawiki,
XHTML or EPUB, then the OLE objects are not rendered or requires further

So OLE objects must be kept in their source format for update /
maintenance but converted to images when inserted in a document aimed to
be exported to alien formats.


True, but exporting in SVG is supported by epub and xhtml and preserves the benefits. EPS would best match PDF. For the others, yes, of course you'd need to convert to image.

I just realised LO offers the user no control of the image formats chosen during export. I don't know whether it automatically picks the best match to the target capabilities, or the simplest (convert to JPEG or PNG). Is that covered in one of the documents?

If someone went to the trouble of embedding SVG (or EPS) images to ensure lines stayed crisp - would export to an HTML format (or PDF) preserve that, or convert to images? I'd say I'm now way off topic and straying into the feature request area.



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