Re: Spectros not measuring the same
Re: Spectros not measuring the same
- Subject: Re: Spectros not measuring the same
- From: "Mike Stewart" <email@hidden>
- Date: Fri, 15 Jan 2010 11:39:25 -0600
Thanks for the quick response. Error formula was CIELAB. I do not know
about the UV-Cut on the other spectro; nor do I know about the backing
surface. Both are obviously excellent questions. - Mike Stewart
"dpascale" <email@hidden> writes:
>Hello Mike,
>
>Errors are normal, large errors no, so we need more info.
>
>> in turn use either another i1Pro or another vendors unit we see
>sometimens
>> a rather huge difference in measurements.
>
>How much on average? (Please indicate the error formula, CIELAB, CIE94 or
>CIEDE2000)
>
>> I've checked that all settings have been the same -
>
>Including if both units are UV-Cut or non-UV-cut?
>Is the measurement backing surface the same in both cases?
>These two factors could create a large error for some papers.
>
>On top of that you have to add the error due to inter-instrument
>agreement .
>Assuming both units are in proper order and within their certification
>parameters, this is about 0.4 CIEDE94 on average and 1.0 CIEDE94 max for
>aan
>i1 (or about the double in CIELAB, so 0.8 on average and 2 max). Please
>no te
>that these errors are given in relation to BCRA calibration tiles, and
>nott
>an IT8 target, so actual errors wil be higher than these specs.
>
>If comparing to an instrument from another vendor, you also have to
>considper
>the absolute calibration error difference between instruments which,
>unfortunately, is not available, but this error is more than the
>inter-instrument agreement of each instrument!
>
>Danny
>
>email@hidden
>www.babelcolor.com
>
>
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