© All Rights ReservedI experimented further and found something similar to, but still not quite the same as this marbled effect. I once again used my "veined marble texture" GIMP script, then applied a GMIC - Patterns - Sponge filter to it. It doesn't create the mottled look that I wanted to match, but it is closer than my previous attempt.
I just updated to the latest GMIC release 22.214.171.124, but now the Steampunk Pencil filter is missing. I liked that one and need to find out what happened to it. I determined that it was in release 126.96.36.199 but disappeared in release 188.8.131.52 even though they list it for the current release on the website.
I need to determine how to call GMIC from a GIMP script, so I can reproduce the Steampunk Pencil filter, which was described as being:
GMIC - Black and White - Pencil
GMIC - Artistic - Kuwahara