Re: X-Rite Instrument Correlation
Re: X-Rite Instrument Correlation
- Subject: Re: X-Rite Instrument Correlation
- From: Lorenzo Ridolfi <email@hidden>
- Date: Thu, 10 Jul 2008 13:56:34 -0300
Bob,
Thank you.
Bob Binder wrote:
In the specific case of the i1iSis vs. the i1Pro - if measuring media
that does not contain optical brightners, or you are comparing
measurements that do not contain UV data (in other words you are using
UV Cut data), the correlation between these instruments should in fact
be quite good. Where you can see differences is when comparing non UV
Cut data from media that does contain optical brightners. The reason is
that the level of UV component in the light sources is not the same.
Because of this, the media being measured fluoresces differently under
the two light sources. When this happens the readings differ because the
colors being measured are in fact different.
When I read your explanation, I thought the differences in light sources
would affect only the lightest patches and won't have any influence in
the patches I'm getting problems: 100% cyan and 100% magenta. I decided
to plot the spectral values to investigate the error source in detail.
The difference is very big at 380 nm and almost finishes at 420nm. It
seems to be caused by different light sources in the range affected by
OBA, so your explanation seems to be correct!
The spectral plots from the cyan and magenta patches are here:
http://www.colorpixel.com.br/tmp/eye_one_versus_isis.jpg
In Lorenzo's case,
some of our e-mail notifications were being routed incorrectly. Once we
saw his post we were able to identify and correct the problem.
Peter Freid contacted me this morning. Thank you.
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