Computer Tips - How can I make a .PNG or .ZIP file smaller?

Date: 2018mar1
OS: Linux, Windows
Keywords: shrink, save space, compress

Q.  How can I make a .PNG or .ZIP file smaller?

A.  Advancecomp is made for just this.

https://github.com/amadvance/advancecomp
http://www.advancemame.it/

A good way to use it:

advzip -z -k -4 *.zip

-z = recompress the specified archives
-k = keep the zip time
-4 = best compression