Re: measurement device trivia question
Re: measurement device trivia question
- Subject: Re: measurement device trivia question
- From: Mike Eddington <email@hidden>
- Date: Thu, 4 Dec 2008 14:28:24 -0500
The iOne Pro does NOT have a filter, and I haven't found info about
the
appropriate Measure Tool settings.
Is this device luminant fixed?
If yes, should I be using the D50 or D65 setting within Measure Tool?
You'll likely want to use the D50 setting. The differences between the
D50 and D65 setting relate to the calculation of the reported Lab
values. Choosing D65 will give you different Lab values that will not
correlate well with the rest of the graphic arts world as it relates
to printing/proofing. There are obviously situations were one might
want to change the illuminant setting, but in general the settings are
D50 and a 2 degree observer angle are the default for graphic arts.
The actual illuminant in the iOne is fixed, and actually is neither
D50 or D65...more like illuminant A.
I would also guess that you would want to use the D50 illuminant
setting even with a D65 filter on the spectrolino, as I believe the
intention of the filter is to enhance the signal to noise ratio for
the blue region rather than shift all values toward a different
illuminant, but again, if you intend to use/compare measured Lab
values with the rest of us, unfiltered and D50/2 degree is the way to
go. (Mike flinches in anticipation of up coming filtration
arguments). ;)
Mike
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