any free program for extract cmyk bitmaps from pdf

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leaf

Hi,
I'm looking for any free program (for Windows) which can extract cmyk bitmaps from pdf file.
I know that is a lot of free programs which can extract bitmaps, but cmyk are converted in rgb mode in this operation.
Even Inkscape or Scribus 1.5 svn always extact bitmaps in RGB mode.

Have you heard of this program which will do in cmyk mode?

Reagards