@ LondonUK371 I case you ever come back
I confess, I know didley-poop about Scheme. I do not know why "colour"-LUT does not return a value in Gimp-2.9.5 It might be a bug.
A little gentle alteration and attached might work for you. Remember to unzip it.
If your Partha Gimp 2.9.5 runs with --pdb-compat-mode=off then expect to see 'deprecated procedure warnings' However you should still get a result.
I confess, I know didley-poop about Scheme. I do not know why "colour"-LUT does not return a value in Gimp-2.9.5 It might be a bug.
A little gentle alteration and attached might work for you. Remember to unzip it.
If your Partha Gimp 2.9.5 runs with --pdb-compat-mode=off then expect to see 'deprecated procedure warnings' However you should still get a result.