At John Palmieri's suggestion, I am duplicating this message that I posted
on sage-release on this list:
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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