QTR-Quadtone RIP

Hi Howard
just to see if i have understood well

I scanned the ink_limit_pattern and misured the L value with photoshop
and found that 

on K for limit 30 i have L=24
on C and M for limit 90 i have L=35 ---> on K i have L=35 for limit 15
on Y,LC,LM for limit 90 i have L=45 ---> on K i have L=45 for limit 10

so i created a curve with 
C limit 45 (half of 90) and denisty = 15/30*100 = 50
M copy corve from C
LC limit 30 (90/3) and denisty = 10/30*100 = 33
Y copy corve from LC
LM  copy corve from LC

why you choose :  
GRAY_HIGHLIGHT=4
GRAY_SHADOW=8
GRAY_OVERLAP=16
GRAY_GAMMA=1
am i supposed to make some other considerations ? 
a good starting point wasn't 
GRAY_HIGHLIGHT=10
GRAY_SHADOW=10
GRAY_OVERLAP=
GRAY_GAMMA=1

Here my new .qidf i named the curve with your name :-)

PRINTER=QuadR260-MIS
CURVE_NAME=MK-EAM-HOWARD_1
GRAPH_CURVE=YES
N_OF_INKS=6
DEFAULT_INK_LIMIT=30
BOOST_K=35
LIMIT_K=30
LIMIT_C=45
LIMIT_M=45
LIMIT_Y=30
LIMIT_LC=30
LIMIT_LM=30
N_OF_GRAY_PARTS=3
GRAY_INK_1=K
GRAY_VAL_1=100
GRAY_INK_2=C
GRAY_VAL_2=50
GRAY_INK_3=LC
GRAY_VAL_3=33
GRAY_HIGHLIGHT=4
GRAY_SHADOW=8
GRAY_OVERLAP=16
GRAY_GAMMA=1
GRAY_CURVE=
N_OF_TONER_PARTS=0
TONER_HIGHLIGHT=10
TONER_SHADOW=10
TONER_GAMMA=1
TONER_CURVE=
N_OF_TONER_2_PARTS=0
TONER_2_HIGHLIGHT=10
TONER_2_SHADOW=10
TONER_2_GAMMA=1
TONER_2_CURVE=
N_OF_UNUSED=0
COPY_CURVE_M=C
COPY_CURVE_Y=LC
COPY_CURVE_LM=LC

a last question : have i to print with 1440 dpi on EAM ?

many many thanks
Paolo

--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> 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
> >
>