Re: 3rd party rips, profiling, and ink limits.
Re: 3rd party rips, profiling, and ink limits.
- Subject: Re: 3rd party rips, profiling, and ink limits.
- From: Jim Rich <email@hidden>
- Date: Sun, 09 Oct 2005 15:43:02 -0400
Michael,
Here is a methodical approach combined with trial and error testing and a
few tips for setting up the ink limits , linearization and profiling of a
rip.
If you were too look at a variety of rips you would find that each rip
has a variety of controls and tools they offer. Some rips are simple and
might or might not have ink limiting or linearization options. OTOH some
rips are complex and have in-depth and complex ink limiting or
linearization tools. And there are rips that have tools that fall in between
those extreme examples.
Also, as you develop optimum values for a rip / printer you have to create
test prints during each step of this process to verify the adjustment and
that your rip settings are done correctly so as to produce the results you
expect.
A way to consider using a rips ink limiting or linearization controls is
to decide what you are trying to accomplish when it comes to creating a
print. In my view there are only two basic types of prints.
(1) A pleasing print ( say that is produced in photographic workflows).
(2) An exact visual match (to say a press sheet).
These two types of prints (pleasing or an exact match) then influence how
much ink you put down on the paper.
Obviously, one of the first steps in ink limiting is to be sure there is not
too much ink printed on the paper. That is the ink is not pooling or worse,
ink is wet and is sitting on top of the sheet so it can easily rub off.
Once you get the rip to control the ink, so that the inking on the paper
is reasonable ( not too little ink or not too much ink), you can refine
the ink limit by using an ink limit test target that offers different
percentages of ink when printed.
This type of ink limit test target will allows you to (1) measure critical
ink values and (2) visually determine the amount of ink you want or need on
a sheet. If the rip has ink limiting features you can then use the values
from the ink limiting target and dial those optimum values in to the rip in
via the rips user interface.
One type of measurement is to determine what combination of ink creates the
the lowest L* values in black image area. Another measurement is the chroma
of each ink cyan, magenta, and yellow.
So if you are creating pleasing pictures where you want to achieve maximum
blacks and optimum chroma on each print. This approach will allow you use
measurements to methodically setup the rip to achieve that.
Or if you are creating a match to say a press sheet you can use the rips
tools to control the chroma of the ink jet print. To better match the press
sheet.
Of course in either case, the rip has to have those controls that allow you
to alter each color ink channel. And these types of adjustments are often
done via the linearization controls of a rip.
An example of reducing chroma via a rip is if you are trying to match a
press sheet where the cyan, magenta and yellow chromas are lower (on the
press sheet) than the chromas of the ink jet printer.
In this approach you can use the rips controls to reduce the chroma of
each individual ink color channel in the rip. This strategy will allow the
resulting inkjet prints to have C,M,Y, chromas that are more inline to the
press sheet, so you can better match the C,M,Y, chromas of the press sheet
using the rip/inkjet printer and a profile.
Jim Rich
On 10/9/05 11:27 AM, "Michael" <email@hidden> wrote:
>
> I'm intersted in comments from anyone who uses a 3rd
> party RIP and generates their own profiles.
>
> What's the best way to establish ink limits? Is it a
> trial and error process, or, is there a systematic
> methodology one can follow to get the best results?
> Also, do ink limits vary by channel?
>
> Thanks, Michael
>
>
>
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