Re: Postershop and Ink Limits
Re: Postershop and Ink Limits
- Subject: Re: Postershop and Ink Limits
- From: "Peter Merck" <email@hidden>
- Date: Sat, 6 Jul 2002 23:53:57 -0400
Darran wrote:
>
Could any please explain the following on how the ink limiting feature
works
>
within PosterShop. I am trying to linerize/Profile a Mimaki JV4 with
>
Pigment inks on Water colour Paper without success.
>
>
1. How do you get the ideal ink limiting, and how do you know?
>
2. What do you set the lighter colors to in relation to the above?
>
3. What do you then set the ink limits for the smaller/medium dots?
>
>
Any advice will be greatly appreciated.
Not having checked my mail for several days, I see that Postershop has
reared up and bitten some people in the butt.
Yes it has a very steep learning curve, bugs and sometimes little or
confusing information, but I live with it everyday to RIP for my grand
format printer. (you'd think a printer with 6 colors 24 printheads and 128
nozzles a head would have better than 300 dpi) Although I will say that the
printers resolution causes most of the low res look, but the printer
manufacturers rule of thumb is if you can't see the defect from beyond 4 ft
then don't worry about it. We also use it for an HP 5000 with good smooth
results, but to get closely accurate color is to do the profiling yourself.
And so....
Q2 first, the book recommends that the lighter ink limit should be about
10% less than the regular ink restriction. IOW 100%C with 90%lc, or 80M and
70%lc. This works, and I've also been told that the same numbers for
regualr and light ink color can be used. I've only profiled one material
this way and don't see any problems.
Q1 is alittle tougher, because this is where you prevent the printer from
over saturating the paper. This is one the features of Postershop I like
but it's also one of the, I guess, magical? Print out the scales and pick
one? I've been working on this problem for a while trying to come up with
measurement type procedure to follow. With some theory thrown in, please
commetent:
Set your ink restrictions (not limits yet) in the server part of the
software (I'll assume everybody has the same server/postershop/profiler
setup) to 100Á 100Â 0Ã same for the other colors except Y,K just
100%Y2,K2.
Print the dark restrictions file with "no profiles selected" from
postershop. Now for theory: Taking a densitometer measure the C,M,Y,K
scales at the top of the file. Starting at 100% and work backwards. If you
can read differences in the blocks densities then you haven't reached the
that ink/paper limit, add the ink restictions third level. IOW if 100%C
density is higher than 95% density then you can probably still bump up the
ink restrictions in C3. Reprint the file. When you've reched a point when
the densites don't hcange for the 100-98-96% blocks you've reached the ink
saturation (not limit yet).
Linearize next.
Q3.Now print the ink limit file. This file prints both the light and
regualr ink so only 1 limit is used (if the Mimaki set up is different let
me know)The book says pick a block that doesn't bleed into the others above
3.0. I've been measring the C,M,Y,K scale second from the bottom. Measure
4.0, 3.9, 3.8 etc. Most densities numbers will be the similar, but at some
point they change, this is the number I put in (3.6 or 3.2 etc.).
Now that you have ink restrictions, linearizations and ink limits, go ahead
and profile.
Pete Merck
Sorry this is long.
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