[argyllcms] Re: Colprof question
- From: "Fabrizio Levati" <fabrizio.levati@xxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Wed, 5 Nov 2008 15:44:54 +0100
Nikolay,
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"...
Fabrizio
----- 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.
Thanks
Fabrizio
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