Use PNG 1-bit palette

[mmitchell-w]

Have you considered saving PNG using a 1-bit palette depth? In my tests with GIMP, that can save around 66% of the file size versus RGB (256x256).

See http://www.libpng.org/pub/png/book/chapter08.html#png.ch08.div.5.1

We're producing tens of thousands of these at once, so the size reduction would be noticeable to us.

[guitarrapc]

Appreciate the request. Since this library renders via SkiaSharp, and SkiaSharp’s PNG encoder doesn’t expose palette/bit-depth options (such as 1-bit palette), adding this feature isn’t planned. We could consider it if SkiaSharp adds native support; otherwise achieving it would mean replacing the rendering backend.