Optimizing ./ttyplot-ping.png
Input size: 16135 (15K)
Result size: 11509 (11K). Percentage of original: 71.329%
Result is smaller
Optimizing ./ttyplot-snmp.png
Input size: 23758 (23K)
Result size: 16608 (16K). Percentage of original: 69.905%
Result is smaller
https://github.com/google/zopfli
Output was: