QTR-Quadtone RIP

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



--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> Hi Paolo
> 
> MIS sell a lot of inks so I'm still not sure what inks you have in
which 
> positions. You have Eboni black in the K position with, it appears from 
> the qidf file, 5 further grey inks (at vastly different limits) in a 
> hextone partition where the darkest grey is in the M position followed 
> by successively lighter greys in the C, LM, LC & Y positions. Is that 
> correct? Which MIS set is that? (MIS do sell UT-RC inks for the R260
but 
> the arrangement you have here would not be appropriate for that as
it is 
> a tritone set with duplicate inks in the C & M positions and in the 
> LM,LC & Y positions.)
> 
> LIMIT_K=30
> LIMIT_C=25
> LIMIT_M=75
> LIMIT_Y=5
> LIMIT_LC=12
> LIMIT_LM=25
> N_OF_GRAY_PARTS=6
> GRAY_INK_1=K
> GRAY_VAL_1=100
> GRAY_INK_2=M
> GRAY_VAL_2=38,33
> GRAY_INK_3=C
> GRAY_VAL_3=29
> GRAY_INK_4=LM
> GRAY_VAL_4=16,66
> GRAY_INK_5=LC
> GRAY_VAL_5=11
> GRAY_INK_6=Y
> GRAY_VAL_6=5,66
> 
> How did you arrive at these limits? The Magenta position sticks out as 
> being much highter than the rest & it might be that that should be 
> reduced but without knowing what inks you have it is difficult to say 
> for certain.
> 
> One further question - are you printing at 1440 or 2880dpi? At 2880 a 
> limit of 75 would probably be too much for EAM.
> 
> regards
> Howard
> 
> paolovertullo wrote:
> > morning Howard,
> > yesterday night i made same tests and you are right. 
> > I added an overlap and it was much better but there is an overinking
> > problem. The magenta ink arrives to his darker grey after starting to
> > overload the paper.
> > have i to use magenta in a range where it doesn't overink ?
> > I use MIS ink with ebony black with an Epson R265 (european version
> > for the r260) and Epson Archive Matte paper.
> > 
> > thanks
> > Paolo
> > 
> > --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@> wrote:
> >>
> >> Paolo
> >> 
> >> What inks are you using here? The ink limits vary widely and this is
> > not 
> >> like any partition I have seen before. If I was to guess at the
> > cause of 
> >> the problem I would say that, upto the 98% spot, the magenta
position 
> >> ink in combination with the black ink is overinking the paper
reducing 
> >> dmax. Because you have no overlap the black is on its own at the
100% 
> >> step and you're dmax is therefore restored (with an overlap the
magenta 
> >> would still fire at the 100% point). You could test this by
adding an 
> >> overlap of say 8. If I am right this will reduce the reading at 100% 
> >> more in line with that at 98%. However this test is only
confirming the 
> >> problem - overinking - which still needs to be resolved.
> >> 
> >> (I've also not seen the use of commas as decimal places in qidf
files 
> >> before but I guess you would be having greater problems if these
were 
> >> not allowed).
> >> 
> >> regards
> >> Howard
> >> 
> >
>