06-17-2022, 08:03 AM
I think this is not only a scripting issue but a GEGL issue. The Gimp 2.10 posterize in the pdb is essentially GEGL with a backward compatibility 'wrapper'. A demo here using the Filters -> Generic -> GEGL graph, it is the posterize filter with blending mode.
Unfortunately in keeping with the old (Gimp 2.8) posterize there is no way of applying the GEGL blend modes. Also they are not replicated in the layer modes although you can get an "effect" by adding some other procedure (maybe).
Unfortunately in keeping with the old (Gimp 2.8) posterize there is no way of applying the GEGL blend modes. Also they are not replicated in the layer modes although you can get an "effect" by adding some other procedure (maybe).