Le 27/04/2016 21:19, Georg Baum a écrit :
Scott Kostyshak wrote:
Even in the case where imagemagick could produce low quality results, if
imagemagick is used for the conversion for the PDF wouldn't it make
sense to also use it for LyX's display? This would give the user a
better chance of realizing that the final output is poor quality.
If the final output is produced on the curent machine (and not on a
different one with better converters), and if it is pdf, then yes. If the
final output is xhtml with native svg images, then it could be worse. But to
be honest I have no idea whether this is only a theoretical use case, or
whether it matters in practice.
Is there a criteria to detect "bad" svg converters (at least some of
them)? In the other message you wrote about "explicit svg->png
converter". What does explicit mean?
Is performance a concern here? I had the same experience as Guillaume in
that the conversion takes a tad longer. I do not think it is
significant, and the more accurate conversion seems to be a larger
benefit than the cost of half a second. It might be nice to test on a
document with 100 SVGs that are included to see how performance is in
that case.
Performance is definitely a concern if the converter cache is turned off. I
invented it exactly for this reason: When working on a book with 200 pages
and lots of images (mostly xfig) it took a few minutes until all image
previes were visible, and each new preview that appeared caused some
scrolling.
If the converter cache is turned on I would not expect a performance
problem, but it would definitely be good to confirm that with a short test.
I experienced it with about 20 svg images and it went as you describe:
computation in the background, delays the first time the previews are
displayed. I can imagine how it would be annoying with many more images
and no converter cache. Are there reasons to turn off the cache?
If the issues are the delays and the scrolling impedance, then here's a
workaround (not for 2.2.0 obviously): display the qt version until the
preview is ready.
