How to use LibreOffice to blur and save a PNG?

LO is not designed to do that;
           but there are numerous programs which will do a very good job
for you -
          many of these are even free for the individual user and can be
located
            http://www.techsupportalert.com/

Hi,

Sorry to nitpick here but I am not dure we want to recommend freeware (and not free and open source software) to our users. Many Freeware download sites are famous to bundle spyware in the software they distribute.

I am a bit surprized to see this "techsupportalert" being mentioned several times by an actual moderator of this mailing list.

There are a few websites listing free and open source software:
http://www.opensourcewindows.org
http://www.opensourcemac.org
http://www.osalt.com

And many more.

Best,

Charles.

Never tried to do it with Draw, but Gimp definitely does it.

See: http://docs.gimp.org/en/gimp-tool-convolve.html
3.14. Blur/Sharpen

Hope this helps.