[Gimp-user] c2g in Gimp 2.10.12 not performing as in 2.8

[rich404 <forums gimpusers com>]

> GEGL's c2g function in Gimp 2.10.12 performs very differently as
> compared to
> v2.8.  the outcome is much brighter, and the deep blacks are gone that
> were so
> helpful to simulate a film-based appearance.  i played with the
> settings for
> radius, samples and iterations but nothing comes close to the former
> appearance.
> clicking the 'shadow' button didn't improve the result.  so, the
> current stage
> of c2g is pretty useless for me - unless i do something substantially
> wrong.
>
> can somebody help me how to get c2g behave in Gimp 2.10 as it has in
> 2.8 ?

I do not think it is possible. I have looked at this previously so not just a
passing thought.

The change log for GEGL is here: http://gegl.org/NEWS.html Down in GEGL-0.3.30
this came in

quote - c2g and stress have gained the ability to toggle the influence of the
shadow neighborhood or not, the new default is to not improve shadow detail;
yielding a bit more natural renditions - unquote

Gimp 2.10 has moved on since then to GEGL 0.4  Using GEGL 0.4 command line with
c2g produces the same effect as Gimp 2.10 so no solution there.

I also have a 'buntu 16.04 with GEGL 0.3.25 Does that work? No.  The command
line produces a slightly different version but still not the same as  Gimp 2.8,
still too light.

Best bet. Depends on OS but run a portable Gimp 2.8 as well as Gimp 2.10,
otherwise find a combination of other filters that produce that grainy effect.

-- 
rich404 (via www.gimpusers.com/forums)