Question: Measuring Delta E from two different spectrophotometers (odd problem)
Question: Measuring Delta E from two different spectrophotometers (odd problem)
- Subject: Question: Measuring Delta E from two different spectrophotometers (odd problem)
- From: Richard Brackin <email@hidden>
- Date: Fri, 25 Aug 2006 12:40:21 -0500
We have supplied identical (or as close as it can get) color standards
to some manufacturers.
We are all measuring L*a*b* values of a series of films against those
standards, (Green, Blue, Red, Purple, Gray, and Orange, etc.).
We, as well as their color laboratories, are taking measurements on
these very specific pigmented colors and we're all using different
measuring devices.
In discussing the issue with the head of color matching at one lab, we
are seeing similar (not extremely close, but similar) L*a*b*
measurements for the standard.
However, we're all seeing color variances of approx 1 delta E on all of
the colors except this particular orange.
While they are seeing 1 delta E comparing the orange to the standard,
we're seeing 13 delta E.
We're measuring Delta E (CIE 1976) D50 at 10 degrees.
(CIE 1994 Graphics shows approx 6 delta E but we've been asked to use
CIE 1976).
What are some factors that would make one color show up so differently?
Should we be using a different color model for measurement?
The standard probably has a variance of 0.5 delta E across the surface.
They are using DataColor SF600 Plus and we're using BYK-Gardner
ColorGuide Sphere.
The Data Color uses Xenon, the ColorGuide uses LED.
Could the pigments used to make their orange color cause such a drastic
difference in measurement between the two light sources?
many thanks
Richard
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