[argyllcms] Re: DE2000 Tolerance Ellipsoids

  • From: <graxx@xxxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 14 Apr 2020 09:24:12 -0400

Thanks Jack!

 

/ Roger

 

From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On Behalf 
Of Jack Hogan
Sent: Tuesday, April 14, 2020 2:47 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: DE2000 Tolerance Ellipsoids

 

Speaking of Matlab, the attached may give some pointers and is how I dealt with 
something similar here:

 

https://www.strollswithmydog.com/just-noticeable-difference-color/ ;

 

jack 

 

On Tue, Apr 14, 2020 at 5:30 AM Graeme Gill <graeme@xxxxxxxxxxxxx 
<mailto:graeme@xxxxxxxxxxxxx> > wrote:

graxx@xxxxxxxxxxxx <mailto:graxx@xxxxxxxxxxxx>  wrote:

Would anyone have any experience calculating DE2000 Tolerance Ellipsoids?

https://1drv.ms/u/s!AkD78CVR1NBqk8g4WLQJjsLHmizXUw?e=o9a6Ce
<https://1drv.ms/u/s%21AkD78CVR1NBqk8g4WLQJjsLHmizXUw?e=o9a6Ce>

Hi Roger,
        no experience, but I know how I would go about it. Short
of an analytical approach, the pragmatic approach would be to
simply use a numerical minimizer to locate points in the a*b*
plane in a given direction that have your target ellipsoid delta E 2K.
Feed vectors around the circle, and plot your ellipsoid. Coded
in a compiled language this would be pretty fast. I guess it could
be coded in something like MATLAB or GNU Octave as well.

Cheers,
        Graeme Gill.

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