If anyone wants a internet-free app on OSX, try ImageAlpha! It's great, lots of settings to try and optimize PNGs. https://pngmini.com/. - Source: Hacker News / almost 2 years ago
For non photographic images, I use a combination of ImageAlpha and ImageOptim and sometimes crop the image to 2x of the maximum expected display size (2x so that the image will stay sharp on high-DPI screen). Keep in mind that my method uses the lossy compression approach. Meaning that you wouldn't want to use my method on your master images. Source: over 2 years ago
Try ImageAlpha by the same author as ImageOptim for transparent PNG optimization. Source: about 3 years ago
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