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JRemen

Indexed PNGs with 8 bit alpha

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A work-around solution is to download ImageAlpha http://pngmini.com/

 

Export as full 24bit transparent PNG files in Affinity, and optimize in ImageAlpha.

For images which require more than 256 colours, ImageOptim is a good choice on Mac.

https://imageoptim.com/

 

If you have access to Windows, the best overall solution is ColorQuantizer. http://x128.ho.ua/color-quantizer.html

Any number of colours, with numerous down-sampling algorithms, many quality options, and a custom quality mask brush for precise control.

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