(03-09-2023, 01:44 AM)HavingTooMuchFun Wrote: I don't appear to have Grain Merge mode…? Is this a Mac vs PC thing, or part of that plug-in that doesn't exist for the Mac?
Nothing to do with Mac, it's in all GIMP for all platform, it's not an external/third party plug-in
Which version of GIMP do you have? it was already in GIMP as far as I can recall oldest version, even before (LCh modes might be later, but not Grain Merge)
Question: Did you scroll down enough on the list?
GIMP has 38 layer's mode! (+1 specific only for the group, and +1 specific for filters), Grain merge is the 28th in the list