It should be noted that ImageAlpha, the app under the pgnmini.com url, provides a GUI to to PNGQuant and PNGNQ. While a command line tool is useful by itself,

It should be noted that ImageAlpha, the app under the pgnmini.com url, provides a GUI to to PNGQuant and PNGNQ. While a command line tool is useful by itself, using lossy compression is best done in a GUI to determine how much compression draws the right balance between file size and its loss in quality. ImageAlpha is amazing for this.