[argyllcms] Spectrometer measurement of Colorchecker SG etc targets.

  • From: Ernst Dinkla <info@xxxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 17 Sep 2010 11:08:05 +0200

Curiosity mainly.
Targets made with more pigment colorants than the IT8 chromogenic CMY dye versions.

What are the conditions if one wants to measure targets like that and get data comparable to the manufacturers reference values?
Are Eye One Basic or Isis spectrometers up to the task?
Are the target paper and colorants free from any fluorescent effect - FBA content? There is not a kind of UV light balancing trick with the target patches created in any of them? Should one measure them with an UV cut spectrometer or one that covers UV as well? Is the use of targets like that in scanners (with little or no UV light and more or less 5000 K discontinuous CCFL light) not better served with a more suitable set of reference values than for use with cameras, indoor and outdoor? Spectrometers with different lightsources?
The data preferably packed as CGATs 17 spectral files?

I have seen the discussions on where to get the reference values of the Colorchecker SG and Lasersoft's more or less identical checker. Robin Meyer has done spectrometer measurements on most of the ColorChecker types. BabelColor's measurements of the deviations between individual targets and changes in manufacturing specs in time for the normal Colorchecker. I see different approaches in measuring, no archive that has all the measurements and according to Babelcolor quite some difference between the generic target values and what is measured on individual targets.

Met vriendelijke groeten,      Ernst

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