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Worth mentioning as well is TinyPNG - http://tinypng.org/ http://tinypng.org/, a free web service that uses lossy compression to shrink PNG images.

• ars 14y ago
  If you want it locally: http://pngnq.sourceforge.net/ http://pngnq.sourceforge.net/ I think the service simply uses that program behind the scenes.
  • SquareWheel 14y ago
    No, they use their own tech. It uses some pre-existing algorithms but it's currently not available for offline use.
    • pornel 14y ago
      TinyPNG uses http://pngquant.org http://pngquant.org and optipng.
      • SquareWheel 14y ago
        It's a bit more than that, I know advpng is also used somewhere in the process.
    • j_s 14y ago
      http://news.ycombinator.com/item?id=4167964 http://news.ycombinator.com/item?id=4167964 (by molf, apparently someone involved in creating TinyPNG) > Mostly pngquant (the new version), optipng and > advpng. We are still tuning parameters and > swapping in and out tools based on our benchmarks > and testing suite. from their debut on HN back in June, where they caught a lot of flack for being a web service: http://news.ycombinator.com/item?id=4167964 http://news.ycombinator.com/item?id=4167964
      • SquareWheel 14y ago
        Interesting read, thanks.
• SquareWheel 14y ago
  In my tests, it's lossy, but it's just barely lossy. Keep your original and deploy this version on your site. I just wish they had an API/offline utility.
  • benmanns 14y ago
    While I didn't see any public mention of it, you can use curl --data-binary @your-file.png http://tinypng.org/api/shrink
    • SquareWheel 14y ago
      That's fantastic, thanks. I wonder if they'd mind me creating a batch tool for personal use...