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Comment by Sir_Cmpwn | Hacker News Reader

This isn't magic, it's just optipng. I did this locally and got the same file (literally, with the same md5sum):

    optipng -o 3 foobar.png

Also, MediaCrush does the same thing transparently+losslessly when you upload a number of files, and it's open source. https://github.com/MediaCrush/MediaCrush

Has anybody tried Piped Piper?

Their Weissman scores are incredible!

Yeah, but their 3D video compression sucks

Why bother with Pied Piper? Nucleus will launch soon and I'd rather trust my data to an established brand like Hooli than an unknown startup.

im working on something similar, it gave me an insight i thought i forgot about a bit ago.

Another open source option is PageSpeed, which does it on the fly as an Apache/Nginx plugin.

(Disclaimer: I work on this.)

Maybe for that image, but I got totally different results with a sample PNG (with Compressor being much smaller than optipng).

Did you set it to lossless? I didn't investigate the lossy conversion because I can't stand lossy compression.

Edit: Just tested with another image, same result.