Re: Yellow too high on GRACoL 7
Re: Yellow too high on GRACoL 7
- Subject: Re: Yellow too high on GRACoL 7
- From: Jon Crook <email@hidden>
- Date: Thu, 06 Apr 2006 10:29:37 -0500
- Thread-topic: Yellow too high on GRACoL 7
Our paper is a=.03 b= -2.4
On 4/6/06 10:27 AM, "Jim Rich" <email@hidden> wrote:
> Roberto,
>
> Your comments are pragmatic, but technically, using paper with a load of
> brighteners and a spectro with a uv filter means you are outside of the G7
> specifications.
>
> Jim Rich
>
>
> On 4/6/06 10:24 AM, "Roberto Michelena" <email@hidden> wrote:
>
>> 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).
>
>
>
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--
Jonathan Crook
Prepress Technician
Corporate Image
www.corp-image.com
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