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.cul...@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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