CMYK PDF profile problem

> I have a serious problem with a large number of PDFs,
colorspace CMYK.

Try

  identify -verbose image.pdf

and see if it reports CMYK as the image colorspace.  If not,
grab a more
modern version of ImageMagick which keeps CMYK PDF's in the
CMYK colorspace.
Older versions convert CMYK PDF's to RGB.  If it is CMYK,
verity you have
included the LCMS delegate library with your ImageMagick
build.  Type

  identify -list configure

it should say -llcms on the LIBS line.  If you are using
Windows, LCMS is
included.

Now try your conversion.  You need two color profiles as in

  convert image.pdf -profile ColorSWAB.icm -profile sRGB.icc
image.jpg
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