[argyllcms] Re: Colprof question

  • From: "Fabrizio Levati" <fabrizio.levati@xxxxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Wed, 5 Nov 2008 15:44:54 +0100

you are right about the TIL but what I am trying to understand is why, starting 
from the same characterization data (FOGRA39) and using the same TIL and a 
similar Black generation rule, I am not able to obtain a result similar to that 
produced by different profiling software. The problem is that I find almost 
impossible to manage the CMY inks level the way I want. The same TIL, as you 
say, can lead to a black curve that ends at the upper right corner of the 
graph, only if you can limit/define the amount of CMY versus K along the whole 
range from 0 to 100%.
In the list there are experts that can say if I'm wrong saying that we are 
speaking about what is normally called "Black Width"...

  ----- Original Message ----- 
  From: Nikolay Pokhilchenko 
  To: argyllcms@xxxxxxxxxxxxx 
  Sent: Tuesday, November 04, 2008 5:18 AM
  Subject: [argyllcms] Re: [argyllcms] Re: Colprof question

  It's a characteristics of the inks. At the right side of graph is the 
blackest color that is possible. But the blackest is by no means maximum black 
ink. The most black color is achieved by the mix of inks taking into account 
the TIL. The absorption by spectrum of color inks and black ink are multiplies. 
The black ink alone not so black as the mix. Moreover, taking in account the 
reflection power of inks, increasing of black in the blackest formula leads to 
decreasing blackness. So the black can't reach upper right corner at certain 
TILs. Yo can play with TIL and may be You get black at upper right corner.

  -----Original Message-----
  From: Fabrizio Levati <fabrizio.levati@xxxxxxxxxxxxxx>
  To: <argyllcms@xxxxxxxxxxxxx>
  Date: Mon, 03 Nov 2008 22:49:36 +0100
  Subject: [argyllcms] Re: Colprof question

  Now that I learnt something more, getting the same plots as yours, I'm still
  wondering: why it seems impossible to push the black curve end point toward
  the upper right coordinates limit?
  Don't get me wrong, I'm not saying that Argyll is supposed to behave exactly
  as another CMS but I just want to learn as much and as well as possible from
  your experience.


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