Can produce larger output, still overwrites input
Ken said, on 28/09/2021
pingo -s9 5b.png pingo - (2.99s): ----------------------------------------------------------------- 1 file => -0.64 KB - (-0.03%) saved ----------------------------------------------------------------- Seems consistent for input file. Rare though, have only seen this happen once out of a thousand images. I appreciate reporting the 'negative savings' though.
cédric (dev) said, on 01/10/2021
would be fixed in next release — thanks for report