Re: Spectral to Lab Data Conversion?
Re: Spectral to Lab Data Conversion?
- Subject: Re: Spectral to Lab Data Conversion?
- From: Nick Wheeler <email@hidden>
- Date: Thu, 27 Feb 2003 09:06:25 -0500
on 2/27/03 3:11 AM, Roland Campa at email@hidden wrote:
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If needed I can also send it via eMail.
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And Grzegorz Lucki wrote:
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Yes, it's easy. Just open spectral data in ColorLab and then choose
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Filter-Conversion-CIE Colors. Then you can select any illumination and
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observer you want. Same procedure for density conversion (using different
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filters).
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The only problem I'm aware of is that recently Measure Tool (v. 4.1.1) is
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using different internat format for spectral measurement. Previously it was
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like:
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BEGIN_DATA_FORMAT SampleID SampleName nm380 nm390
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and so on but now is:
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BEGIN_DATA_FORMAT SampleID SampleName SPECTRAL_NM_380 SPECTRAL_NM_390
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and so on.
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So simple conversion (replacing "SPECTRAL_NM" with just "nm") in text editor
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is necessary before opening measurement file in ColorLab (v. 2.8).
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Andrew Rodney wrote
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I'm pretty sure you can do this in GretagMacbeth's (Logo's) ColorLab. The
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exact process isn't on the tip of my tongue (and I know there are others who
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are vastly more savvy on this powerful utility).
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Roland, Grzegorz, Andrew:
This worked perfectly. I was able to download the new version of ColorLab
successfully.
Once I was able to perform the objective comparison outlined in Real World
Color management I was able to shake that uneasy "measuring the unknown
room" feeling I mentioned in my post yesterday.
In fact the objective measurement comparisons matched my subjective
evaluations perfectly. It is truly a wonderful thing to be able to confirm a
suspicion both objectively and subjectively. Great book!!
In addition to Roland and Grzegorz, Boris Oicherman sent me a color
calculator applet that he wrote for this purpose and Bruce Lindblom pointed
me to an Excel spreadsheet dedicated to the task. I continue to be
dumbfounded at the generosity of spirit and knowledge embedded in this
little community.
Let's also not overlook Logo/Gretag's generosity in making the ColorLab
application available for free. It is also incredible to me just how good
ProfileMaker has become (I'm sure this is true of other apps as well). In
the objective "round trip" comparison outlined in Real World Color
Management on tests I am conducting with the Epson 2200, ProfileMaker
achieved an average delta E of less than 1.95.
Best wishes,
Nick Wheeler
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