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: Fri, 1 Nov 2002 20:12:28 -0500
>
The Gray Balance file is also suppose to help one set up a good gray
balance
>
before linearizing. I have not had much luck adjusting the gray balance
this
>
way, I guess the idea is that if you can attain a good gray balance in a
raw
>
unlinearized state then the ICC will have less work to do. I can get a
fairly
>
good balance with just the dark inks turned on but once I add in the
lighter
>
shades it all shifts again. Maybe this is where the transition control
would
>
come in to play but I have never messed with that setting. Besides, from
what I
>
have read part of the job of the ICC profile is to bring around any
imbalance
>
anyway and so far with my methods I am getting very good grays.
My greys are not perfect to start with without a profile, but they do fall
into place with. At least we can get close. Getting grey balance seems to
an adsession with some people.
>
> I don't change any curves. Can you give me more info on this tip.
>
> >
>
>
Yes, this is supposed to help the printer image the darker patches with
greater
>
saturation if I remember correctly. This will help Inkjet Printers in
>
particular and was recommend for them specifically.
>
>
When you first build a Lin file in Onyx, right after you finish reading
the
>
patches and say "build" you are asked how to manage the file, Basic
Density
>
Curve is the top choice in the dialog box -there are about three others-
and
>
recommended if one is building an ICC profile. (I am not in front of my
RIP
>
computer so I hope my memory of the dialog boxes is correct) You can also
>
access this from the tweak botton for a prebulit Lin file.
The second one is to build a grey balance profile for use in 'advanced'
settings for 'Job Profiles' in the server. I tried this one once, never
figured it out completely.
I've experimented a little with this and also adjusting the N-factor
setting. This helped a little for minor tweaks, but I went further and
reprofiled and the resulting file looked the same as before the N-factor
change. So the profile just readjusted the image back.
>
>
Once you pick Basic Density it brings up the next window which has three
tabs
>
to it. The First Tab shows a graph with points marked along the curve. It
is
>
this screen that you want to be in, the other two are actual readings and
the
>
last shows how the data is being massaged.
Hit analize on the third window to see if there are any problems.
>
>
> The ink limit file's only restriction is the lin curve. I only really
look
>
> at the 2nd from the bottom line the CMYK line. I will Den measure the
>
> patches from 4.0 down. Most of the time 4.0-3.8 numbers are the same or
>
> really close. The patch that the numbers start to differ is the one I
use
>
> as my ink limit numbers generally 3.4-3.8.
>
>
>
>
Actually this limits the ink in the other direction I think, the ICC
profile
>
itself and if you are setting a limit lower than 400% this figure should
also
>
be indicated in the ICC build window.
Are you using Postershop to build your ICC profiles? This is why I don't
get into some of the sections of the program you mention. We don't have
this portion installed on any of our systems. When I started working there,
I had to order a profileing software package (Gretag Profilemaker) to create
the profiles. They were using the default profiles and were always making
color adjustments. Things have calmed down significantly once I started to
put good profiles in the proper slots.
>
> >On my Arizona I wouldn't want just K for type. The ink never appears to
be
>
> dense enough compared to 4c type
>
>
Exactly, that's why I thought maybe this would work. I never run text as K
only
>
because it lacks density, I always let K become a build.
>
>
Steve Upton just shared some thoughts on the Ink Restriction thing and he
>
prefers using the Ink Limit setting for controlling the end result and
seems to
>
rely less on individual head restrictions. The next thing I want some
answers
>
on is the check box in the Ink Limit dialog window that allows the GCR to
>
modify the settings (can not fully remember the wording) but I was told to
use
>
this "Allow" setting from 4.0 to 3.5 and under that one should disable the
>
check box.
Haven't heard about unchecking the box for under 3.5 ink limit. From the
book (we had so many at work I took one home for refernce) "If you want
Postershop to adjust the GCR of the pixels within the image to meet the ink
limit you just entered place a check the box below"
I always leave this box blank so Postershop doesn't make any unknown
adjustments to my file. Unknown to me anyhow. If everything is set up
right you shouldn't have to adjust the file. If something looks wrong, I
can trace back to a poor image file to start with.
Warning Editorial Rant: I wish sale people would quit saying "Boy those
flesh tones look red, yellow, green. What's wrong with the printer?
Nothing's wrong; tell you clients to get there act together and stop using a
xerox as a color proof.
One final question: Do you check the profiles of the incoming images?
Sounds like you would, but I have had some people never check this.
Oh by the way the Arizona has built in heaters that maintains a 140 degree
zone to help with drying. Sometimes still not enough.
Pete
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