[argyllcms] Re: Total Ink Limit (aka TAC)

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 02 Jan 2007 22:46:22 +1100

Rolf Gierling wrote:

This is what what the tools I have say as well. They try to pick a nearly neutral black, which is about L: 10,08 a:0,25 b:0,08 with a deltaE of 10,1. (I used your original profile)
>
> ColorPicker (part of the ProfileMaker package) has the ability to
> minimize the deltaE
> and chooses C:100 M:97,0 Y:61,1 K:100.
> This results in L:9,46 a:1,28 b:-0,14 and has a deltaE of 9,5.
> The TAC of this colour is 358,1%.

xicclu gives similar numbers:

xicclu -l350 -a -fif -ir FOGRA39L.icm

9.670000 0.000000 0.000000 [Lab] -> Lut -> 0.971720 0.833173 0.626938 1.000000 
[CMYK]
 Lim 3.431831 (clip) [Actual 9.758660 0.028115 -0.079605, deltaE 0.122425]

0.000000 0.000000 0.000000 [Lab] -> Lut -> 1.000000 0.857409 0.548183 1.000000 
[CMYK]
 Lim 3.405591 (clip) [Actual 9.526161 0.512582 -0.979404, deltaE 9.590084]

Graeme Gill.

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