>>1124599https://css-ig.net/pingarun it in wine and set settings like so
this tool has the best speed/compression ratio of everything i've tried, but it does strip empty alpha channels which are really common on pngs from pixiv from some reason. so if your original png contains an empty alpha channel, the recompressed png will be visually identical to the original but it won't be bit for bit identical if decompressed. if this is a problem, you will need to use an alternate tool such as
https://github.com/fhanau/Efficient-Compression-Tool (use the --reuse option)
