https://bugzilla.wikimedia.org/show_bug.cgi?id=24854

           Summary: Black/striped thumbnails of certain JPEGs
           Product: MediaWiki
           Version: 1.17-svn
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: upstream
          Severity: minor
          Priority: Normal
         Component: Images and files
        AssignedTo: wikibugs-l@lists.wikimedia.org
        ReportedBy: hart...@videolan.org
                CC: gpaum...@wikimedia.org, bryan.tongm...@gmail.com


See the original upload of
http://commons.wikimedia.org/wiki/File:Wikipedia_parel_poster_A1.jpg

The thumbnails for this upload rendered in a striped black. This is most likely
caused by ImageMagick using the EXIF colorspace by default. In the case of this
image, the EXIF colorspace is set as "uncalibrated" which probably makes IM
default to RGB, whereas this is a CMYK image. The ICC however notes "color
mode: CMYK, Color profile: ISO Coated v2 (ECI)'

Intermediary solution is to convert the image using a graphics program from
color mode CMYK to RGB and saving it with colorprofile sRDB for instance.

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