Bulk convert PNG-24 to PNG-8 files with best quality

Posted by Gavin on Super User See other posts from Super User or by Gavin
Published on 2011-02-17T06:55:54Z Indexed on 2011/02/17 7:27 UTC
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png

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imagemagick

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bulk

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image-conversion

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image-transparency

Hi,

Can anybody recommend a good method of bulk converting a large amount of PNG-24 files to PNG-8 with as little loss of quality as possible and maintaining transparency?

I've tried ImageMagick but the resulting images weren't quite as crisp quality as I'd like. Using Paint.NET I was able to achieve far better results, but I can't bulk process with this tool as far as I know.

The settings I used with ImageMagick in case there's better options to use: convert file.png -depth 4 file-output.png

I've also been playing with OptiPNG, but I haven't discovered a was of making sure the output images are PNG-8.

Cheers, Gavin

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