Richard, 

> That was easy, when I commented away #1, I got the regular b/w
> positive image that I wanted all along.
> 
> So.
> 
> It seem the cm-calibration plays a role in this.  Of course, I
> understand that it could be a good thing to have it true, 

Indeed as this tells CUPS to avoid doing any CM on its side.

> but does
> that mean that I should do some sort of color calibration of my
> printer (which, I'll remind you, is a b/w laser printer, and with
> pretty few levels of grey to boot...)?  How do I do that?

I think the proper solution for now is to set cm-calibration only if
there is a printer profile used. If there is no printer profile we do
not care about what CUPS will be doing anyway.

Thanks a lot for the test! 
-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B


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