Did not read the post which says - The attached, somewhat
modified for Gimp 2.8 looks like this:
This script has previous, from 2008:
viewtopic.php?p=108 there might even be a version of the script somewhere on Gimpchat, I do not know.
My interest is more historical, It comes from a GUG (Gimp User Group) tutorial
https://web.archive.org/web/20091204155 ... als/ronq2/Not a 100% sure that the script is completely adaptable for Gimp 2.8 / 2.10 there is section that applies a alpha color-curve that is a bit dubious. It could do with a complete re-write, not a tweak.
However, already 'tweaked' a Gimp 2.10 version, attached.see next post