[argyllcms] Regarding fitting of Shaper / LAB / XYZ input profiles (question to Graeme)

  • From: Derin Korman <derin.korman@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 11 Jun 2014 23:09:10 +0100

Hello Graeme,
First of all, thank you so much for all the work, I use your software all
the time and have just started using it for some professional work, so I
will make sure to donate sometime soon. If you'd like, I can help with
reformatting the website a bit for increased legibility also, without
touching the content.

Anyhow, to the question.
For input profiles such as scanners, could you expand on the processes of
the different profile types, as to how they go from the input/reference
data to the cLUT / curves? I am assuming that the shaper is higher
polynomials smoothed by lower order ones to create io curves for each
channel, but I don't understand if XYZ / LAB employ some sort of smoothing
to fit the cLUT itself, or whether the CMM that uses the profile for
conversion uses its own smoothing based on the look up table data.

Thank you very much!
*ps it could be helpful to have these on the website too maybe?


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