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I have an atlas of assets in a transparent png with 8-bit alpha (660kb) and I want to compress it.

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Could you suggest what options do I have? When using a pngquant (I'm using SuperPNG plugin for Photoshop), I'm getting a 58kb file but color is transformed to 8bit palette and there's not enough colors to have smooth gradients (balloons are a good example). The original atlas I'm working with has two times more assets so compression is even more visible...

enter image description here

Is it possible to get something like in-between result? I'd be happy with 150-200kb file with more colors and alpha. Maybe I can use imagemagick with some funny options?

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