I was looking into this today for a site that wants all uploaded PNG files to be kept in the PNG format. What I was finding is that after setting png to jpg quality to 100, Discourse will still convert large PNGs to JPGs unless the recompress original jpg quality setting is also set to 100. Is this the expected behaviour? If so, the description for the recompress original jpg quality setting needs to be updated to describe how it affects PNG uploads.
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