Re: Color Measurement
Re: Color Measurement
- Subject: Re: Color Measurement
- From: Mike Eddington <email@hidden>
- Date: Tue, 14 Jul 2009 16:07:34 -0400
- Thread-topic: Color Measurement
>One way to solve this issue is to always calibrate your instruments to a known
independent standard. Each instrument then has corrections factors applied to
reference it back to the standard. This can drastically reduce the
inter-instrument agreement issue. This is best accomplished with spectral
devices. There are some companies that offer remote services for this
calibration. GretagMacbeth used to have this for instruments like the ColorEye
series. I am not sure if X-Rite still continues this service.>
While this certainly couldn¹t hurt, I¹m not sure that this would actually
address the issue entirely.
>From my experience, instruments of different makes can report similar values
on certain reference substrates, and deviate more real world substrates. For
example, I have several Xrite instruments here that agreed fairly closely on
the Lab-Ref card in 2007. In 2008 I purchased a new Lab-ref card and noticed
my i1 measured significantly different from the prior year, despite the fact
that the it still measured comparable when using the 2007 card. The
difference was traced to card¹s lamination...the matte coating in the 2008
card, versus the gloss laminate on the 2007 card. Our Xrite 938 measured
close to the supplied values in both cases, but the i1 devices did not. I
obtained a new card with gloss lamination and the i1 devices once again
measured favorably. In short, I don¹t think calibrating instruments to a
known standard goes quite far enough to prevent differences on varying
substrates, at least not enough to prevent issues resulting with tight
tolerances.
Mike
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