Reducing PNG file Size
Colt McAnlis

“Setting up a VQ step in your pipeline can help you get a better sense of the true number of unique colors that your image uses, and can help you reduce them significantly. Sadly though, I don’t know of any image optimization tool out there that allows you to specify these values manually. So you might have to create your own VQ code to do this.”

Kornel Lesinski’s pngquant does exactly this, and it does it well:

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