Re: Measurement Geometry was: Big problems using Bill Atkinsons new Eye-1 profiles
Re: Measurement Geometry was: Big problems using Bill Atkinsons new Eye-1 profiles
- Subject: Re: Measurement Geometry was: Big problems using Bill Atkinsons new Eye-1 profiles
- From: Roger Breton <email@hidden>
- Date: Sat, 18 Feb 2006 09:33:19 -0500
Ken,
> D50/2 is a reference to the colorimetry, not the spectral measurements.
> So yes, you would still use D50/2 because it is for a graphics industry
> ICC workflow and that is the standard.
That is crystal clear. I wouldn't think you would have suggested D65/10
which is the standard in non-graphic arts applications.
> By "SCI" I assume you mean specular component included (also referred
> to as SPIN). That's a little harder question and the answer will depend
> on your use.
My intuition told me that SPIN was a no brainer. But, I'll read on your
explanation below.
> In general, I'd suggest specular component excluded (SPEX)
> because this is more similar to the typical way that people view
> prints.
In general, all right.
> In other words, you rotate the print until there is no glare
> effectively excluding the specular component. There are other factors
> that can influence the decision however, but again, it will be specific
> to your application.
>
> Ken Fleisher
In the case of canvas, maybe I am wrong or my conclusions are wrong but I
was under the impression that we're dealing with a rather matte surface,
here. So, if we consider the surface as rather matte, wouldn't you expect
the specular component to be rather weak or negligeable? A straight test
would be to measure SPEX and SPIN and compare the readings, I know. Which is
what I do below using a Minolta CM-508d on Epson Canvas material:
White (unprinted)
---------------------------
SCI 96,77 -0,12 -1,34
SCE 93,62 0,71 1,86
100% Cyan
---------------------------
SCI 42,01 -3,10 -50,04
SCE 40,15 -3,74 -46,62
100% Magenta
---------------------------
SCI 51,00 60,98 18,81
SCE 49,30 59,97 20,37
OK, Ken, it does make a difference. So, measuring SPEX will produce very
different profiles for this material, obviously.
Still, according with the general wisdom on the List, sticking with 0/45
geometry will produce superior profiles. I won't debate that.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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