QTR-Quadtone RIP

Hi Paolo

The UT-RCN set has only 3 different dilutions of ink:
K - Eboni
Dark Grey - M & C which are identical
Light Grey - LC,LM & Y which are identical.

If you find the shades are not as above then the issue is one of MIS 
quality control.

Ideally then, you would have use a 3-way partition (rather thn 6) and 
use the copy curve facility for the duplicate inks. A typical set up for 
2880dpi printing might look something like this:

...
DEFAULT_INK_LIMIT=30
BOOST_K=35
LIMIT_K=30
LIMIT_C=18
LIMIT_M=18
LIMIT_Y=15
LIMIT_LC=15
LIMIT_LM=15
N_OF_GRAY_PARTS=3
GRAY_INK_1=K
GRAY_VAL_1=100
GRAY_INK_2=C
GRAY_VAL_2=38
GRAY_INK_3=LC
GRAY_VAL_3=15
GRAY_HIGHLIGHT=4
GRAY_SHADOW=8
GRAY_OVERLAP=16
GRAY_GAMMA=1
...
COPY_CURVE_M=C
COPY_CURVE_Y=LC
COPY_CURVE_LM=LC
...

Note that the limits for M & C are halved & those of Y, LC & LM are 
divided by 3 as you split the required density across the ink positions.

The reason MIS sell sets like this is that they can be used for printing 
directly with the Epson driver. With Qtr you obviously have more 
flexibility  such as being able to use a warm set alongside the neutral 
set to give you a choice of tones and split toning. However if you go 
with the single set with the duplicate inks you should get smoother 
results as more nozzles are firing at once.

EAM = Epson Archival Matte

regards
Howard

paolovertullo wrote:
> Hi Howard
> i bought UT-RCN Cartridge Set (6) Neutral Tones w/Eboni 
> RCN-CART-SET-K from inksupply.com site.
> 
> i have Eboni black in K position and for the other positions i
> followed the name printed on the tanks.
> After i printed the ink_limit_pattern i can see that M is the darkest
> grey followed by the C and then Y,LC and LM are lighter.
> You see so different limit because M and C are very close as dark
> greys and Y,LC,LM also as light greys.
> In order to use all the 6 inks i have choosen to use Y,LC,LM for
> different portion of light gray and M,C for different portion of dark
> grey (i don't know if i am clear enough). 
> May be i will arrive to the same result if i use only three ink (K,M,Y
> for example) but why MIS sells kit with ink so close one to another ? 
> 
> Yes i am printing at 2880 dpi.
> What doesn't EAM means ?     
> 
> bye
> Paolo
>