Re: Yellow too high on GRACoL 7
Re: Yellow too high on GRACoL 7
- Subject: Re: Yellow too high on GRACoL 7
- From: Jim Rich <email@hidden>
- Date: Thu, 06 Apr 2006 11:25:08 -0400
- Thread-topic: Yellow too high on GRACoL 7
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:
> 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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