Is "Advanced Compression" Lossy?

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2022-05-16 01:37:51

When exporting for web, I know reducing a PNG's color palette to 256 is lossy, but what about the "advanced compression" option?

I read an old post saying it uses some of the same tools as ImageOptim, but ImageOptim has lossless and lossy compression. Is Pixelmator Pro's "advanced compression" lossless or lossy?

Thanks
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2022-05-17 14:47:34

Hi arandor, in short, Advanced Compression is lossless, as are all pure PNG compression algorithms. It's only things like Color Palette reduction, or other methods of lowering image quality in order to lower file size, that are lossy. Advanced Compression doesn't perform any such actions - it consists entirely of the "Compression stage". Hope that makes sense!