[argyllcms] Re: Host spectral measurements instead of ccmx/ccss?

  • From: Florian Höch <lists+argyllcms@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 12 Sep 2011 09:07:08 +0200

Am 12.09.2011 03:02, schrieb Graeme Gill:
Florian Höch wrote:
it just occured to me: Wouldn't it be better to just host spectral .ti3
files instead of .ccmx files? This would reduce the 'combinatorial
explosion', as colorimeter users can always make the 2nd measurement to
create a .ccmx themselves (given a spectral measurement of their display
is available). What do you think?

Hi Florian, I'm not sure what you mean. If you follow this idea to
a practical conclusion you end up with CCSS files, but they depend
on each colorimeter having sensor spectral characterisation data.
i1d3's are like this, but no other colorimeter is, as far as I know.

CCMX files work because they avoid needing to spectrally characterise
the colorimeter - the colorimeter is used to measure the actual spectral
output of the display in question. You can make a CCMX from two .ti3 files,
but they both effectively contain colorimetric values. The .ti3 from the
colorimeter _can_ only contain colorimetric values.

It could well be I'm missing something obvious (if so, apologies). What I pondered is, to create said ccmx file, one can either do the measurements "on the fly" using ccxxmake if they have both the spectro and the colorimeter, or create small testcharts via targen and measure them separately, then feed the resulting .ti3 files to ccxxmake. So I thought, colorimeter users which don't have a spectro just need a .ti3 measured with a spectro for their screen (which could be provided by another user of the same screen model who doesn't need to have the colorimeter), as they can always create the colorimeter .ti3 themselves. Of course, the caveats like screen and instrument variability would still apply (but atleast the colorimeter measurement will be matched well to the particular user's instrument), but instead of hosting ccmx files for each screen x colorimeter combination, wouldn't it then be enough if just a .ti3 of a screen, measured with a spectro, was available (the colorimeter ti3 would then need to be created by the individual users themselves, also the actual ccmx creation from the two files)?

Florian Höch

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