Re: Measuring Delta E from two different spectrophotometers
Re: Measuring Delta E from two different spectrophotometers
- Subject: Re: Measuring Delta E from two different spectrophotometers
- From: Richard Brackin <email@hidden>
- Date: Fri, 25 Aug 2006 15:31:53 -0500
We just did another test.
We compared the readings from the Gretag Eye-One Photo vs the ColorGuide
Sphere.
Those are the two items we have in house.
The Eye-One measured a 2.4 delta E difference (using Eye-One Share Software)
The BYK-Gardner measured 11.9 delta E difference on exactly the same patch.
The Eye-One Share software is calculating delta E using LAB (CIE 1976,
just as the BYK Gardner is currently configured)
Digging around, I found a cached PDF on the former BYK-Gardner site.
The following three items caught my attention, and some have already
been brought up here.
1. Traceability to different institutes like NPL or NIST
2. Different instrument design (opticcal principle, size of sphere,
light source)
3. Different spectral resolution (10 or 20nm); has a big influence when
colors with sharp reflection curves are measured.
Oh, and yes.
It's a very, very, VERY bright orange.
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