The ColorMunki only measures from 430 to 730 Nm in reflective mode and copies the 430 measurement down to 380 Nm, I guess with the X-rite drivers. The sensor goes to 400 Nm for emitted light so one would expect the LED to be UV-cut. Any UV absorption + OBA effect shown in results must be extrapolated from 430-730 Nm downwards. Old information from that ArgyllCMS list: http://www.freelists.org/post/argyllcms/ColorMunki-or-i1pro-for-CM,8 Met vriendelijke groet, Ernst Dinkla Grafische Techniek Quad, piëzografie, giclée www.pigment-print.com On Fri, Aug 28, 2015 at 5:08 AM, Ben Goren <ben@trumpetpower.com> wrote:
On Aug 27, 2015, at 4:23 PM, Ben Goren <ben@trumpetpower.com> wrote:
The GCATS file
Cancel red alert, as they say.
Turns out the XYZ and Lab values were calculated using a spectral measurement of a low-CRI fluorescent lamp as the reference instead of D50, and the measurements below 420 nm apparently have no bearing on reality. Re-calculating the absolute values with D50 gives a very reasonable Lab 96.69498 -0.854171 0.157998, and ignoring values from 430nm and bluer has reflectivity varying only from 90.4% - 92.7%.
In other words, it was a number of completely unrelated coinciding unusual things conspiring to mimic the appearance of FWA in the chart, despite there being not even the slightest drop of FWA present.
``We apologize for the inconvenience.''
b&
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