The input I've gotten so far removed any remaining doubt about porting 
those layer modes to LCH, so I've done that now:

commit 18603ac192493296b191197a3e2b62c710398afd
Author: Martin Nordholts <>
Date:   Sun Aug 2 21:35:10 2009 +0200

   Bug 401754 – Port Hue, Saturation, Value to CIE LCH

   When using GEGL for the projection, use CIE LCH for the Hue,
   Saturation and Value layer modes, just as we already do for the Color
   layer mode. The Value layer mode will later be renamed to Lightness
   since that is the semantics it has now.

  / Martin

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