Re: solid K or open K
Re: solid K or open K
- Subject: Re: solid K or open K
- From: "Peter Merck" <email@hidden>
- Date: Wed, 6 Nov 2002 22:12:29 -0500
>
Since I build my profiles in Onyx, I have the full package, I have never
messed
>
with the Gray Balance selection that comes up after you read the patches
for
>
your linearization file. Plus it seems the only way to access that option
is
>
after printing and reading the patches but before you actually build the
>
linearization step. If you are not building an ICC profile then I guess
you
>
just use the linearization step and then proceed with the gray balance
step and
>
then I think you are done. So your media would be calibrated but not fully
>
characterized.
>
>
Since I use the ICC method I can not use this gray balance option.
Right, I think it's there to help the non ICC users. If you linearize, then
profile. At least that is only what non Postershop run printers need.
>
>
> Cyan 1.4
>
Magenta 1.4
>
Yellow 1.2
>
Black 1.1
>
>
A higher N-factor will straighten out the midtone portion of the
linearization.
>
I thought I had a range for these settings in my notes but can not locate
it
>
now. I do remember looking at some of the prebuilt profiles that were
supplied
>
by Onyx for ColorSpan printers and I could not take cues from them as they
>
sometimes were outside the parameters that Onyx had given me.
>
>
I also have listed in my notes that "Scale" will affect the overall
balance, I
>
am assuming that if my grays are looking a bit magenta then I would set
the
>
scale setting for magenta lower than 100% or if I wanted to add some
magenta
>
then I would use a setting higher then 100%.
>
>
The N-factor always sets it's own numbers automatically based on your
readings
>
and these days with the way version 5 handles the media model I never look
at
>
the N-factor numbers anymore.
>
Mine are always 1.4
>
>
Yea, one of the tech support guys at Onyx said this is the preferred
method
>
when working with images, the box being checked on from 3.5 to 4.0.
Doesn't
>
make sense to me though, shouldn't the GCR already be adjusting the file
to
>
what ever your Ink Limit is? You can even leave the Ink Limit step out
>
completely and just do Linearization and then the ICC profile.
I look at ink limits as another step to keep ink from plugging up my prints.
The GCR for the incoming file has shadow numbers, but the ink limit says
that 95%K means this amount of ink and no more. If the other 3 color
numbers change from the original, it's (the ink/paper profile) only trying
to get the same color balance and density with the ink and paper it has to
work with.
>
>
So, what I am wondering is if I tell it to not allow modification GCR to
meet
>
Ink Limit is it then looking to the ICC profile for some type of limit for
the
>
GCR to base it adjustments on? and, would this be an actually read value
or
>
would it be the Ink Limit setting that one can assign in the building of
the
>
ICC profile? (Also, if setting an Ink Limit this number should also be set
in
>
the ICC Build Options dialog window.)
Since I make my profiles outside of Postershop my procedure is to set ink
restrictions, linearize, ink limit, then print the profiles swatch file with
non selected as the input profile. This will grey out the output profile
and the only thing controling the amount of ink hitting the paper is the lin
and ink limit. This is why you can sometimes get a brighter color, but a
down side is that a tint of 100M, 65Y might look orange if your yellow ink
is really strong.
>
>
The new Media Manager in Onyx, since version 5, is based on Profile Maker
from
>
what I understand so maybe some of the settings are similar.
They use the same color engine. I've only used version 5.5.
>
>
A new setting is called Black Width. Does anyone know how this alters the
>
blacks and when would it need to be adjusted?
>
>
>
Yes, we open up all the scans in Photoshop first to have a look and see if
they
>
are tagged. If not tagged we look at a few different CMYK profiles and
make a
>
judgment as to what looks good, and if they have supplied a print I will
>
compare my screen to the print to help in figuring out which profile looks
>
best.
>
>
If it is a profile other then my default choice assigned in the RIP then I
will
>
convert the file to the default before Postscripting. If it is a tiff and
is
>
not placed in Quark or some other page layout program I simply copy the
tiff
>
over to the RIP computer and work with it directly.
>
For most of my non profiled files (great argument for tagging a CMYK file) I
use a profle based on waterproof we use in the shop. This gets me at least
close to Swop press conditions and can at least match the CMYK side of a
pantone book. For ones that are tagged I change the input profiles in
Postershop to match. I mostly work on files from quark and Illustrator
saved out as EPS. It saves some time not to change the raster files and
rebuilding the customers file.
Pete
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