I think this should be discussed at sage-devel.
On Wednesday, June 28, 2023 at 8:49:51 AM UTC-7 vdelecroix wrote:
> I agree with Marc that svg is almost always preferable than png for
> graphics : it scales and compresses. Thanks for raising the issue.
>
> Do you have a concrete proposal for making the change png -> svg
> happen? I guess there is a lot of files that would be involved in the
> transition.
>
> Vincent
>
> On Wed, 28 Jun 2023 at 16:23, Marc Culler <marc....@gmail.com> wrote:
> >
> > Details really do matter. The devil is in them. Here is one which makes
> a major difference to my efforts to distribute Sage. I hope that I can
> convince people to pay attention to it.
> >
> > DETAIL: An svg image can be compressed very efficiently and will look
> good at all resolutions. A png image can not be compressed, being already
> compressed, and pixelates at high resolutions.
> >
> > BACK STORY: I am working on adding documentation to the Sage_macOS
> distribution. Size is important. For 10.1beta3 the English documentation
> occupied 631MB, and compressed down to 104MB. For 10.1beta4 the
> uncompressed size increased by over 100MB due to the addition of 100MB of
> png images. Now it only compresses to 207MB, doubling the compressed size.
> >
> > There is no need for this wastefulness. Here is an example:
> >
> > sage: D = graphs.DodecahedralGraph()
> > sage: p = D.plot()
> > sage: p.save_image('/tmp/dodec.svg')
> > sage: p.save_image('/tmp/dodec.png')
> >
> > The result:
> > % ls -l /tmp/dodec*
> > -rw-r--r--@ 1 culler wheel 42735 Jun 28 08:48 /tmp/dodec.png
> > -rw-r--r-- 1 culler wheel 18524 Jun 28 08:48 /tmp/dodec.svg
> > % gzip /tmp/dodec*
> > % ls -l /tmp/dodec*
> > -rw-r--r--@ 1 culler wheel 39473 Jun 28 08:48 /tmp/dodec.png.gz
> > -rw-r--r-- 1 culler wheel 3815 Jun 28 08:48 /tmp/dodec.svg.gz
> >
> > BOTTOM LINE: we get more than a 90% reduction in size simply by choosing
> to use the .svg extension when saving the plot instead of the .png
> extension.
> >
> > I am not allowed to upload an svg file to google groups, so you will
> have to verify for yourself that the svg looks better than the png, but it
> does.
> >
> > - Marc
> >
> >
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>
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