Re: Yellow too high on GRACoL 7
Re: Yellow too high on GRACoL 7
- Subject: Re: Yellow too high on GRACoL 7
- From: "Roberto Michelena" <email@hidden>
- Date: Thu, 6 Apr 2006 09:24:46 -0500
Jon,
Could it be too much optical brightener in your paper? some offset
papers pump up the use of FWA (Fluorescent Whitening Agents) in order
to achieve brightness at a lower cost. Unfortunately that confuses the
spectrophotometer, which reads it as bluish. Actually to be fair the
spectro is right, human vision is the one fooled, but let's say the
spectro fails to model this. A UV-filtered spectro helps in this case.
Anyway, what's your paper white Lab coordinates?
Do you see that gray (the one that measures bluish) as neutral or as
bluish? (compare with K).
-- Roberto Michelena
Infinitek
Lima, Peru
On 4/6/06, Jon Crook <email@hidden> 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?
>
> Help
> Help!
> --
> Jonathan Crook
> Prepress Technician
> Corporate Image
> www.corp-image.com
>
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