This question jogged my memory that we have an expert in our ranks who might give a brilliant answer to this question - Glenn Randers-Perhson:

Coauthor of PNG spec, developer/maintainer of libpng, on development teams for ImageMagick and GraphicsMagick. Author of pngcrush. Maintains PNG support in Firefox. Retired, father of four, grandfather of fifteen.

After a little googling, I was saddened to find that Glenn passed away 2 years ago.

Thank you Glenn for your work on PNG - a vital part of the web as used by literally billions.

Thank you also for your .SE contributions, including those to codegolf. In the few interactions I had with Glenn, he was a real gentleman, greatly knowledgeable and always helpful.


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