https://bugzilla.wikimedia.org/show_bug.cgi?id=29659

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             Bug #: 29659
           Summary: Indexed PNG thumbnails are blurrier than true-color
           Product: MediaWiki
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Images and files
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
    Classification: Unclassified


Thumbnails of PNG images with indexed colors are converted to true-color
thumbnails, which result in a greater file size. Indexed-color PNGs should be
converted to indexed color Thumbnails.

For example (a grayscale), the same images (8b) converted (to 16b) is sharper: 
http://commons.wikimedia.org/wiki/File:Jürgen_Alberts_-_pv_portrait_02-3.png

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