QTR-Quadtone RIP

I think I was mixing things up.
Apart from the HPhotoRag-neut curve I printed also with the raw curve for matte papers. The raw curve produced slightly better highlights but still clearly tinted...
Do I have to split tone later with the cold curve in order get a fairly neutral tone?

As for the Dmax I have absolutely no idea how to improve it.

The wedge printed far more neutral with the ABW mode. And the Dmax slightly increased (1,55).


--- In QuadtoneRIP@yahoogroups.com, "siiaam" <s-i-a-m@...> wrote:
>
> Hello,
> 
> I am printing with an Epson 3800 loaded with UC K3 ink.
> After determining the ink limits and crossovers I printed a 21 step wedge in order to linearize it. For printing the wedge I have chosen the HPhotoRag-neut raw curve.
> Unfortunately the highlights do have a green tint.
> Also, the Dmax I reach is 1,51. According to Clayton Jones' website he measured a Dmax of 1,62 for the same ink/paper combination...
> 
> http://www.cjcom.net/articles/digiprn5b.htm#Soft Textured Art
> 
> I am not that experienced with QTR. So I appreciate any suggestion that may improve my results.
> 
> Stephan
> 
> 
> Here's my curve so far (before linearization with ink limits and crossover values):
> 
> #  QuadToneRIP curve descriptor file
> #
> #  for ultrachrome k3 inks
> 
> N_OF_INKS=8
> DEFAULT_INK_LIMIT=50
> 
> LIMIT_K=50
> BOOST_K=55
> LIMIT_C=5
> LIMIT_M=3
> LIMIT_Y=0
> LIMIT_LC=6
> LIMIT_LM=8
> LIMIT_LK=37
> LIMIT_LLK=35
> 
> #
> #  Describe Usage of each Ink: K,C,M,Y,LC,LM,LK
> #    All Inks of Printer must be listed
> #
> 
> #
> # Gray Partitioning Information
> #
> N_OF_GRAY_PARTS=3
> GRAY_INK_1=K
> GRAY_VAL_1=100
> 
> GRAY_INK_2=LK
> GRAY_VAL_2=28
> 
> GRAY_INK_3=LLK
> GRAY_VAL_3=9
> 
> GRAY_INK_4=
> GRAY_VAL_4=
> 
> GRAY_HIGHLIGHT=6
> GRAY_SHADOW=6
> 
> GRAY_GAMMA=1
> GRAY_CURVE=
> 
> #
> # Toner Partition Information
> #
> N_OF_TONER_PARTS=2
> TONER_INK_1=C
> TONER_VAL_1=100
> TONER_INK_2=LC
> TONER_VAL_2=30
> 
> TONER_HIGHLIGHT=6
> TONER_SHADOW=6
> 
> TONER_GAMMA=1
> TONER_CURVE="0;0 25;23 50;41 63;55 75;70 85;85 100;100"
> 
> N_OF_TONER_2_PARTS=2
> TONER_2_INK_1=M
> TONER_2_VAL_1=100
> TONER_2_INK_2=LM
> TONER_2_VAL_2=25
> 
> TONER_2_HIGHLIGHT=6
> TONER_2_SHADOW=6
> 
> TONER_2_GAMMA=1
> TONER_2_CURVE="0;0 23;20 50;45 63;60 75;77 100;100"
>