Thanks Mark,
usually I'm already using the highest PNG comression rate = 9 in IrfanView, but I just saw that it has also support for a PNGOUT plugin, although I won't expect more than a few percent size reduction. The PNGOUT plugin is only as a 32 bit version available, but I'm using IrfanView 64.
Last edited by PeterK; 10 May 2018 at 20:39.
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