[magick-users] CMYK PDF read as CMY (without K channel).

[duc.sequere.aut.de.via.decede at imagemagick.org]

> i've verified that the profile is present in the jpeg file.

ImageMagick does not automaticaly apply an image color profile.  You need
to supply a profile for the alternative colorspace (e.g. sRGB) and 
activate the transform with -profile from the command line or
$im->Profile() from PerlMagick.