I rarely play with LUTs and haven’t looked into G’MIC’s management of them, so take my comments with a grain of salt. The reason for bringing up compression is the idea that compressed LUTs must be decompressed. If that is true, I suppose it could become any size, not just 33, 48 or whatever the default is supposed to be. David recently published a paper on this. The link I provided provides the details on that. Here is one of G’MIC’s commands:
