https://bugzilla.wikimedia.org/show_bug.cgi?id=51400

--- Comment #10 from Bawolff (Brian Wolff) <bawolff...@gmail.com> ---
(In reply to Eduard Braun from comment #8)
> My comparison and this bug is about PNG images. Since PNGs are lossless
> their quality and therefore their size can't be influenced (there are
> possibilities to optimize a PNG anyway but those normally don't make a huge
> difference).
> 
> Based on the different rendering the size of the resulting PNG thumnails
> differs also a little bit but nothing nothing notable I'd say and also
> nothing systematic (e.g. sometimes Imagemagick wins, sometimes VIPS).
> 
> I think there's not much to gain at this end (in contrast to JPGs).

I think vips turns indexed pngs -> 8bits per channel pngs which can have a
massive affect on file size (but only affects a small number of files)

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