Re: Yellow too high on GRACoL 7
Re: Yellow too high on GRACoL 7
- Subject: Re: Yellow too high on GRACoL 7
- From: Terry Wyse <email@hidden>
- Date: Thu, 6 Apr 2006 12:05:47 -0400
On Apr 6, 2006, at 10:07 AM, Jon Crook wrote:
Im in the process of fingerprinting right now (Its on press!) and I
am having to run my yellow ink densities to 1.10 to achieve grey
balance which is a little too high for us. We are hitting our lab
values for cyan and magenta at the appropriate densities and when
the lab values are met for yellow, our neutrals read a=.3 b=-6.75.
When I raise the yellow density to 1.10 my lab values are off but
my neutral lab values are right on. Can anyone advise me on the
best way to proceed from here?
Check your TVIs and see where they're at. Specifically, see of you
Yellow TVI is significantly out of balance with the C and M. Also,
1.10 shouldn't necessarily be too high. You said you're checking your
Lab values. Check your Yellow chroma(ab) value and see if it's around
95 +/- 3.
If you find that your density/chroma/Lab values are fine but you TVI
is low on the yellow, that's sort of OK. During the G7 process, you
have the option of correcting the gray balance by adjusting the NPD
curves of the M and Y.
In another post you mentioned your paper. Your paper a/b values seem
fine to me (I typically see more like -3/-4 b* values for most
"house" gloss coated papers).
With the -b you quoted for midtone gray, I'd say you have a fairly
serious yellow TVI problem (or C and M TVI too high?) that needs to
be corrected before moving on.
Terry
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