With OptiPNG 0.7.4 you can reduce the file sizes of PNG graphics files without any noticeable sacrifice in quality. The catch? It's a command-line utility, and you'll have to compile it yourself. But the fact that it's a command-line app also means that you can use it in an AppleScript or an Automa-tor workflow, or set it up as a Folder Action; so images you drop into a certain folder will automatically be optimized. I found that OptiPNG reduced image file size by 30 to 50 percent, which is significant for larger images.
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