[argyllcms] Question about colprof and black point

  • From: Vittorio Villani <vittoriovillani@xxxxxxxxxxx>
  • To: ArgyllCMS List <argyllcms@xxxxxxxxxxxxx>
  • Date: Wed, 17 Nov 2010 00:59:50 +0100

Problem with colprof and black point.
Using:



colprof -v -qh -no -np -ni -i D50 -o 1931_2 -S
AdobeRGB1998.icc -cmd -dpp -kz profilename


I got this :

Creating rspl..
Fine tuning white and black point mapping
White is [...]
Black is 9,994558 0.850210 1.285811, should be 10.012171 0.988195 1.630301

What are the numbers of the balck about? 9,99 is the L* value or what?

My black point is (.ti2 file):
"Q3" 0.0000 0.0000 0.0000 1.0000 1.0000 1.000
The reading of this patch with the ColorMunki software gives me this result in 
L*a*b* values:
L*=4.6
Using profcheck I get this result for the Q3 patch:
[0.219403] 5: 0.000000 0.000000 0.000000 -> 4.715842 1.202572 1.658739 should 
be 4.812903 1.350490 1.624429

So I can't understand what is that black point about.

Can you please help?

Thanks.
Vittorio Villani                                          

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