Note: the call to this constructor appears to trigger inefficient processing in multipage PDFs: http://im4java.sourceforge.net/api/org/im4java/core/Info.html#Info(java.lang.String, boolean)
See the discussion in the related ticket.
This constructor triggers a process that appears to extract information about every page within a PDF, but only the first page is needed for thumbnail generation.
This class does not have a constructor that takes a page number.
I believe that a different mechanism needs to be used to detect the cmyk_profile.
Until this is changed, this media filter will be prohibitively slow when the color profile is enabled.