RE: calculating from abscol to relcol from L*a*b*
RE: calculating from abscol to relcol from L*a*b*
- Subject: RE: calculating from abscol to relcol from L*a*b*
- From: Roger <email@hidden>
- Date: Tue, 21 Apr 2009 21:02:31 -0400
Terry,
I believe the latest version of PatchTool will allow you to do just that,
open a text file and convert it to your choice of PCS (XYZ or Lab), via the
RI of your choice, using your designated ICC profile. And you can massage
the data many ways in passing.
Worth checking.
www.babelcolor.com
Best / Roger
> All I really want to do is to be able to take a typical text
> measurement file of a testchart and convert the "absolute" L*a*b*
> values to relative values in a way that would mimic a absolute-to-
> relative "ICC" conversion. Just imagine taking a list of L*a*b*
> measurements (where I know which patch represents the substrate
> L*a*b*) and transforming them to relative values in a way not unlike
> taking absolute/relative density measurements from a press sheet only
> I want the relative conversion to duplicate what would take place in a
> absolute/relative ICC conversion if I had an ICC profile made from
> this same dataset.
>
> I have a method currently that "works" but I'm getting deltas that
> average in the .30-.50 range with maximum deltas in the 2.0-3.0 range
> compared to a true relative ICC conversion. A colleague of mine has
> graciously given me a spreadsheet that will do what I need but it
> involves the cumbersome step of taking the absolute L*a*b*
> measurements into and out of XYZ to get the relative L*a*b* values.
>
> Regards,
> Terry
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