Re: Convert UV-excluded to UV-included
Re: Convert UV-excluded to UV-included
- Subject: Re: Convert UV-excluded to UV-included
- From: Marc Levine <email@hidden>
- Date: Tue, 22 Dec 2009 16:47:51 -0500
Hi John,
The i1 Pro's (the spectro) hold their calibration data internally. The
device only support 1 calibration state. As a result, you can only use
it with 1 filter (the one that comes attached to its nose). The lino
supported multiple calibration states (I believe) so that you could
use it with or without the UV filter, or with the POL filter. Could X-
Rite make a switchable device? Yes. Is the i1Pro switchable? No. And
yes... both iSis and DTP70 has no problems switching between UVin and
UVex (gosh! I wish we had standard syntax for talking about UV)
To Roger or Chris's question about how OBC works, it works like this:
1) Collect UVin and UXex data (requires 2 scans). These are the
"endpost" data sets.
2) OBC create a series of "spectrally scaled" data sets, going from
UVin to UVex.
3) OBC builds a profile for each data set
4) OBC renders a gray patch for every step in the scale (looks like a
10-step wedge)
5) OBC does this for 3 gray levels. (OK.... 3 10-step wedges)
6) User prints rendered patches and compares to non-flourescing visual
standard (hit include 3 glossy and s matte)
7) User picks the patch that matches perfect and keys the patch
identity (which tells OBC which spectral data set to choose)
8) OBC spits out your OBC's profile, made from your selected,
spectrally scaled data.
It works pretty darned good. The only downside is that, when you think
about it, you are making a profile data that OBC made... not data that
you measured. So let's say that you want to check how accurately you
made a red? We'll.... OBC uses science to ensure a good match, but
that same science un-insures a mathematical match using simple
measurement from a device. If you look at this statement and say "I
have know idea what this guy is talking about... I just want the
colors to look the same!", then OBC is a good thing for you. The
problem underneath it all is that "lowest dE" may not necessarily mean
"best visual match".
Marc
Color Management Group
email@hidden
On Dec 22, 2009, at 2:12 PM, email@hidden
wrote:
So MY question is why cant X Rite make the EyeOne Pro
With a UV Switchable filter like the old Spectroscan ?
It cant be that difficult or is it ? Isis and Dtp 70 can do it !
I find myself with 3 UV Cut EyeOnes that are not suitable for proof or
Press verification.
John R
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