[argyllcms] Re: Black point powell failed

-------- Original-Nachricht --------
Datum: Fri, 30 Jun 2006 12:29:41 +0200
Von: Stefan Heinsen <sheinsen@xxxxxxxxxxxxxxxxx>
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Black point powell failed

> Hi,
> 
> im having a problem with profile. Depending on the
> measuredata profile fails with
> "./profile: Error - set_icxLuLut: Black point powell failed"
> in xlut.c line 3563.
> I tried to debug the problem but failed to understand the
> code. The function powell returns -0.95.
> 
> This happens on a Canon W8400 that can produce extremely
> dark black. With 100% black ink only i get a Lab Value of
> 2.297 3.558 -3.788 and with mixed CMYK black (all inks at
> 100%) its possible to get a Lab of  0.474 0.012 -0.059.

Wow! That's incredible!
 
> Maybe this has something to do with it.
> 
> Any ideas?

I think the current development snapshot on the Argyll web site already 
contains a fix for this well-known problem in V0.53.

Regards,
Gerhard

-- 
Gerhard Fuernkranz
nospam456@xxxxxx

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