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.