Re: MeasureTool Compare question
Re: MeasureTool Compare question
- Subject: Re: MeasureTool Compare question
- From: Roger Breton <email@hidden>
- Date: Sat, 19 Mar 2005 17:22:22 -0500
Thank's mike,
Sounds mighty good. I'm on to a different track. On the heels of ignacio's
suggestions which might serve me purpose in interesting ways. OK, in all
fairness to marti maria I should have downloaded the LittleCMS utilities but
I was much tempted to give Graeme Gill's Argyll tools a try too. So, after
some fighting with the Bash shell in OSX, I was able to run the icclu
utility without everytime specifying its whole path!
Anyhow, now that I figured how to run icclu, I realize I can take my 210 Lab
values, the ones I've used to test my output profiles with so far, feed them
through icclu once to get the matched CMYK values, feed them through icclu
once more to get the corresponding or predicted Lab values.
At that point, all I need to is to print my target, measure it, record the
values, open them up in Excel to compare to the prediction and calculate
DeltaEs. I realize at this juncture is that all I'm interested in is to see
how close to the profile is able to predict the actual or final device
colorimetry! I figure the better a profiler to predicting the device actual
colorimetry the better is the corresponding profile.
Once I figure that the profile acceptably predicts the device colorimetry, I
figure I can just worry about where I find unusually large deviation between
the profile's prediction and reality.
I can see me doing other kinds of interesting analysis down the line but for
the moment that will suffice.
>
> We'll, actually you need Colorlab in addition to MeasureTool and PS in order
> to create a text file of the Lab data, but you could simply create an RGB test
> chart in MeasureTool, open the tif in Photoshop and convert to Lab, then to
> get rid of the values outside the gamut of your CMYK profile, covert from Lab
> to said profile using rel col, then convert back to Lab. This should give you
> relatively evenly distributed Lab values, and all within the device's gamut.
> Save the tif and open it up in Colorlab to export as a text file.
>
> You could do the same thing creating a CMYK test chart and convert those
> values to Lab, but this doesn't guarantee that there are no duplicate patches
> from the IT8/ECI or whatever chart you used to create the profile, and I
> suppose that it may not push the gamut boundaries to the degree you may want.
> mike
>
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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