Re: GCR Problem
Re: GCR Problem
- Subject: Re: GCR Problem
- From: Terence Wyse <email@hidden>
- Date: Mon, 02 Feb 2009 11:51:11 -0500
Hi Jon,
If you're using CMYK Optimizer and the "dynamic" GCR option, the
resulting conversion can be somewhat unpredictable. It's based on a
lot of factors including the actual pixel area in the image. While not
exactly your issue, the program will tolerate a certain amount of
excessive total ink coverage depending on the actual pixel area that
it's sampling and how large it is.
In your case, it might be as simple as the where you have the K start
point set in the GCR setting. If your K start point is, say, 25%, then
what you're seeing would be expected where it would actually REMOVE K
and convert back to CMY. Only solution would be to start the K as
early as you can tolerate.
There's another way to prevent this from happening that may be the
best option. In CMYK Optimizer you should have control over the primary
+K combinations (CK, MK and YK). By checking this option on, it should
prevent what you saw happen. You can do the same for secondary+K
combinations as well (CMK, CYK, MYK).
Regards,
Terry Wyse
On Feb 2, 2009, at 11:25 AM, Jon Crook wrote:
I need help understanding what is going on behind the scenes in
Alwan CMYK
Optimizer. I have it set to apply a certain level of GCR and works
beautifully most of the time but once in a shile I get an image that
seems
to separate the exact opposite to the way that I intend.
Here is an example:
Original build is C=0 M=0 Y=27 K=11
New build through Alwan C=11 M=4 Y=36 K=0
Correct me if Im wrong but isnt this conversion the exact opposite
of what
GCR should be? Since there was not any Cyan or Magenta in the original
build, I would think that there would be no conversion at all. Im
sure Alwan
applies GCR the same way as other ink optimizing programs. Can
anyone tell
me exactly what is going on behind the scenes so I can better
understand
this process.
Thanks,
--
Jonathan Crook
Director of Color Management
Corporate Image
www.corp-image.com
800.247.8194
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______________________________
Terence Wyse, WyseConsul
Color Management Consulting
G7 Certified Expert
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| | >GCR Problem (From: Jon Crook <email@hidden>) |