On Sat, Jul 31, 2010 at 9:13 AM, Sven Neumann <s...@gimp.org> wrote:
> On Thu, 2010-07-29 at 01:56 -0700, Charlie De wrote:
> > And my point is that wasn't such a good decision precisely because it took 4
> > years to get it fixed.  [...]  If my line of thought had been followed 4 
> > years ago,
> > GEGL would most likely already be fixed.
> It would have taken an afternoon or two to fix it. Someone just needs to
> spend that time and actually prepare a patch. This is not a question
> about GEGL or not GEGL. If you feel that it is important to get this
> fixed, then please submit a patch that introduces new fixed color modes.

It might also be nice to get a definition of what it means to be "fixed".

If I understand bugzilla correctly, this issue is bug 325564
(https://bugzilla.gnome.org/show_bug.cgi?id=325564).  Martin's
comments there are that changing the colorspace from HSL to CIE LCH
resolve the issue but do not match Photoshop's results.

I searched for a while and could only find some speculation that
Photoshop may use CIE Lab, though these people claim they figured it
out and that it is custom coefficients in HSY-space:  [
http://www.filterforge.com/forum/read.php?FID=8&TID=319 ].

There may be other resources available, but I found this article to be
a good introduction to some of the issues involved: [
http://en.wikipedia.org/wiki/HSL_and_HSV ].  Hopefully people can read
this and not say things like "only the color should be transferred" --
excluding what - brightness? luminosity? intensity?  Or just admit
that they want GIMP to do whatever it is that Photoshop does.

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